Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d2af1a06cc9ba3…

MALICIOUS

PDF

40.4 KB Created: 2020-08-16 16:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f786efccb5cf6150fb6c15ac1d0a0d54 SHA-1: 7d7dae4a362554eebe7f3cc27bfb33b1d04ec2b1 SHA-256: 03d2af1a06cc9ba32a356700fd7f799e040738dc033627585cc1b6b9968f1d2f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to link farms and a known malicious redirector. The redirector URL, 'https://ttraff.cc/pify?keyword=find+sheet+name+in+excel+vba', suggests a lure related to Excel VBA to entice users to click. The presence of a mass external PDF link farm and the ML classifier flagging this PDF as malicious strongly indicate a campaign to distribute malware or conduct phishing. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious intent.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=find+sheet+name+in+excel+vba
    • http://files.vonderhauswulfgermanshepherd.com/uploads/1/3/0/8/130813797/fivepeno.pdf
    • http://files.huntersvillepres.org/uploads/1/3/1/4/131408203/ruzowap.pdf
    • http://files.banyantreesamui-cuisine.com/uploads/1/3/1/6/131606666/jeloritazido.pdf
    • http://files.southshoreeldercareconsultants.com/uploads/1/3/0/7/130776031/31b38c5e26842.pdf
    • http://jawanok.sunriseagcoop.com/uploads/1/3/0/7/130775493/1fcba278a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2721/6037/files/pdf_pour_apprendre_le_portugais.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/51748572194.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/78058629215.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/citrix_receiver_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5927/2090/files/thyroid_body_type_diet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/1517339100.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/fitamuzuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9443/files/62954794017.pdf
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/bifogifewejajub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe8.bin
3df8a18579be6984fb6cc60b3a2e899201dcf26af298226e812e754f7180c0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 5308 bytes
font_01_sfnt_off000071ce.bin
d837c42975850b124a2acda9c6e795404fe32fb1ab544bfd0536c9688de36ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 10308 bytes

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