Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f40e42a9903aa…

MALICIOUS

PDF

38.2 KB Created: 2020-08-06 21:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74de5025651c33011214ceb84536ba0 SHA-1: e40e6fa9cf301e4d39862dba82512fa3e2ec0133 SHA-256: 5f8f40e42a9903aa24ec9ac09fc87493ec46a569b2894f31b8d12c5c7bc4f308
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=concerning+hobbits+piano+sheet+music+pdf, suggesting a lure to a malicious site disguised as search results. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=concerning+hobbits+piano+sheet+music+pdf
    • http://files.whitelakeumc.com/uploads/1/3/1/3/131383493/9169316.pdf
    • http://files.christinabhoward.org/uploads/1/3/2/7/132712661/710351.pdf
    • http://files.southsurreygardenclub.ca/uploads/1/3/1/3/131398019/tefowipuxuj.pdf
    • http://files.australgecko.com/uploads/1/3/1/3/131380558/5742686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/acidocetose_diabetique.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/kusabogosir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/16986009233.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/metozemudilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9892/files/jadual_kadar_caruman_kwsp_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/32271950104.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/emotional_intelligence_self_assessment_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/themes_in_negritude_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/74915001389.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6202/files/vegorede.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/xusarukinolelamidigekesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/vumujap.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/dojuxulaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/houses_of_the_holy_lyrics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ac8.bin
1275520ccd21679416ff457ac0bd5989db7c94d4410c744d19428e889c1e3b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC8 5584 bytes
font_01_sfnt_off00005d8c.bin
0802c455118b21536781636ce764e0eee569d85ca81da407a7aee4bb6469e83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8C 9388 bytes
font_02_sfnt_off00007dc5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 4324 bytes

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