Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf769d2f14312f9…

MALICIOUS

PDF

41.6 KB Created: 2020-08-15 15:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45395eaad5cfe2c3556e482a31bb6606 SHA-1: 2bcfaf8f2984858610dcffca0edb5be7e59a7b84 SHA-256: 0cf769d2f14312f9f7c20786b5604d6dadb022d22ec98d19cbed9395dc8ad74a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed for SEO manipulation. One prominent link, disguised as a Python tutorial, redirects to `ttraff.com`, which is flagged as malicious redirector infrastructure. This suggests the document's primary purpose is to drive traffic to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/wb?keyword=python%20tutorial%20pdf%20with%20exercises%20for%20beginners%20free%20download
    • http://gitewip.pjgilbers.com/uploads/1/3/2/8/132815176/2875206.pdf
    • http://files.philanthropyadvisorsny.org/uploads/1/3/0/7/130776249/vekelo.pdf
    • http://molumenut.parohia-kassel.de/uploads/1/3/1/6/131636725/17dc36b07211.pdf
    • http://files.joyfulbrush.com/uploads/1/3/0/8/130813461/nareganadiwelu.pdf
    • http://juliro.stmarkshampstead.com/uploads/1/3/2/8/132816202/8833783.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2340/8036/files/gungeon_monster_blood.pdf
    • https://cdn.shopify.com/s/files/1/0436/9665/2443/files/convert_kindle_to.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/7051938324.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/codex_adeptus_custodes_v8.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/towegape.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/93298272909.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/34866295388.pdf
    • https://cdn.shopify.com/s/files/1/0440/0162/4214/files/acls_provider_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/17753854053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/gitevebutakex.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/74267928188.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_off00006364.bin
77891df14c1ca17f5709b90ea37d0c99cfdfdea50467f44b703e916f8caee420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5820 bytes
font_01_sfnt_off0000773d.bin
437772ef98a842d3f296f2355e0f0c264da5f16c346ddcc8e478fdb62eca80db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773D 9716 bytes

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