Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f358e4c49a36544…

MALICIOUS

PDF

44.8 KB Created: 2020-07-21 09:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a355423c5adbc10478384576877e5bec SHA-1: fcf31f2c6a19da4f761e93e1f755c57001517ab2 SHA-256: 9f358e4c49a365440b0b4f9816e9ba6305e75922a63201fe8e2acd210c2f3af8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Half life problems worksheet answers'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a harmful site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/wb?keyword=half%20life%20problems%20worksheet%20answers In PDF document text
    • http://files.latisserande.com/uploads/1/3/2/6/132681337/cc2f70dc8d.pdfIn PDF document text
    • http://files.fiercefirepro.com/uploads/1/3/1/6/131636845/vixexexivijekileku.pdfIn PDF document text
    • http://files.sebianhealingcenter.com/uploads/1/3/0/8/130814674/8293381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5359/6322/files/5745181307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/82998661304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/71629199162.pdfIn PDF document text
    • https://jobupatifela.files.wordpress.com/2020/07/80354316756.pdfIn PDF document text
    • https://womonuxad.files.wordpress.com/2020/06/91594917923.pdfIn PDF document text
    • https://vivikevom.files.wordpress.com/2020/07/15233379272.pdfIn PDF document text
    • https://zexixomiwos.files.wordpress.com/2020/06/93511000154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/9948998231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/betenatadep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/xanowuregurinene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4214/4407/files/jineworuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/puzomojunagiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/46999028568.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 2

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_off000071a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 5184 bytes
SHA-256: 5fd540464ef54cd669fbb49743ce1952c5230488d0e2f85558017c5c08d0188b
font_01_sfnt_off0000831b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831B 10172 bytes
SHA-256: e538a479ff56a1862050d69a29e2b04e796dfd2c017fe3e81b020b012b225921

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