Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe6c5a14dcddea8…

MALICIOUS

PDF

45.2 KB Created: 2020-08-13 22:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b3bdb90402a4a7ef0f9794672427c9 SHA-1: 437a594fb2a9d2ad84d16811d91fa766e4f46ff7 SHA-256: cfe6c5a14dcddea8a7a94d9a636e483ceab23c772783000007edde1cb8e266d3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.ru/pify?keyword=fur+elise+music+piano+sheet'. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content. The ML classifier strongly supports the malicious verdict.

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=fur+elise+music+piano+sheet
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.bartowcountysaddleclub.org/uploads/1/3/2/6/132680789/sotalarikunir.pdf
    • http://libiz.bradfordscholarship.org/uploads/1/3/1/4/131407921/rinimise-pagiv-kilodule-xemub.pdf
    • http://wotupu.warriorhealingcampaign.org/uploads/1/3/1/6/131636725/1007532.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/tolopolukurazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3728/4762/files/sipazofetitasilaxukofalas.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/35548366878.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6909/files/teaching_strategies_in_math.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/gasijawikugasupokak.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/85140454142.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/mibixebagusukog.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/zibuvififuxog.pdf
    • https://cdn.shopify.com/s/files/1/0439/7731/0366/files/successful_business_process_management_paula_berman.pdf
    • https://cdn.shopify.com/s/files/1/0436/8397/1237/files/noligugobafusowuzos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/zorebip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/anaximenes_philosophy.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005043.bin
fa7a1ee13b92d787c6fa95c2c3ea4cb8530a5a5b328d4764c5fcab0c0f79154c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5043 5128 bytes
font_01_sfnt_off00006187.bin
7ef7b9cc03281b27fee8434028c3b9fd29e3cc132d3f5d82e8ce901e7d6c08e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6187 15416 bytes
font_02_sfnt_off000090d9.bin
b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D9 16100 bytes

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