Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9673422b6f13b41…

MALICIOUS

PDF

40.0 KB Created: 2020-07-14 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 3ed31ac77ba6a96690e1cfc7b987537f SHA-1: ec0de562fcd32946a37fe417224942728fd5ff68 SHA-256: a9673422b6f13b41f751ebbbc1cd964dbbb512e68db41bbdf36c798f35e7642d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links pointing to external resources, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an 'abstract nouns and concrete nouns worksheet', potentially to disguise the malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=abstract%20nouns%20and%20concrete%20nouns%20worksheet In PDF document text
    • http://files.salomearchitect.com/uploads/1/3/1/3/131383283/fuxamugorudonamipera.pdfIn PDF document text
    • http://files.lindsay-hamilton.com/uploads/1/3/2/6/132695569/6583356.pdfIn PDF document text
    • http://files.dalisayresearch.org/uploads/1/3/1/3/131379991/kigusajevorezepazup.pdfIn PDF document text
    • http://files.ceasefirelive.com/uploads/1/3/2/8/132816195/tojunalanuref_linawimileje.pdfIn PDF document text
    • http://files.oneworldcircus.com/uploads/1/3/1/0/131071209/mabewef-sopegevoxo.pdfIn PDF document text
    • http://files.worldsate.com/uploads/1/3/1/3/131383575/mevutogejusanu_gokaziluzid_lofutekuwojavo.pdfIn PDF document text
    • http://files.josepblas.com/uploads/1/3/1/4/131437268/kiwinorubidosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://misojedidi.files.wordpress.com/2020/06/16134924603.pdfIn PDF document text
    • https://jafujanile.files.wordpress.com/2020/07/japudik.pdfIn PDF document text
    • https://belerodis.files.wordpress.com/2020/07/xudazaxutatiteb.pdfIn PDF document text
    • https://depezexigit.files.wordpress.com/2020/06/58725914183.pdfIn PDF document text
    • https://taroxow.files.wordpress.com/2020/07/56828110019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/68321230114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/degam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunugituvalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/29297078116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/lofudigosuxukixuxapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/62325718412.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 5112 bytes
SHA-256: ff48d6610021c39fa26274bb4e74823fb43c3878201accd280e0f70c2df490f0
font_01_sfnt_off00007098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7098 9908 bytes
SHA-256: 3db4ed29bc71e44eef95ab9c1f4735e89290c0a581d6b943db1a76a3a4497267

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