Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e103409b0a1539…

MALICIOUS

PDF

35.5 KB Created: 2020-08-01 22:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be8a438173f8d3205bbe7c93fd89b170 SHA-1: a6a7906dfbcd59de63b3dfe97ea41c8bd1002bd0 SHA-256: 61e103409b0a153917341b5ea077190eaa6d8ae18573ddf9e80eae60e3bbf063
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=construction+surveying+and+layout+3rd+edition+pdf', likely leads to a malicious payload or phishing page. The presence of a large number of external PDF links, many pointing to benign Shopify domains but some to unknown domains, suggests a link farm used for SEO poisoning or to obscure the final malicious destination. No scripts were extracted, but the overall structure and the malicious redirector indicate a phishing or malware distribution attempt.

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.cc/pify?keyword=construction+surveying+and+layout+3rd+edition+pdf
    • http://files.klamathforestestates4rma.org/uploads/1/3/1/1/131164425/zegamabunaj_rafixuwumo.pdf
    • http://files.sylvainetlesfilles.com/uploads/1/3/1/1/131164383/kamiveniwa.pdf
    • http://files.encourageleos.com/uploads/1/3/2/6/132695339/adc4614f1.pdf
    • http://files.sehjournal.com/uploads/1/3/2/6/132682868/bipisowak_nugetatenut.pdf
    • http://files.kimirose-wherevershegoes.com/uploads/1/3/2/6/132695372/muvogenetuxebog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/13240352476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/41440111566.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/vaviwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/witagukinojalolarobagep.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/ziram.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/lizowunalaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/19166538102.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/36849288843.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/72462107217.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fusuzirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7670/5692/files/16844197383.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/51566557455.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_off00004c8c.bin
44c33d8daba4f8b3d64955eff50b49d4f8f43fd4b37dbd28be6123d0347d4161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8C 5552 bytes
font_01_sfnt_off00005f8e.bin
652fdefe1f9cbdec2df0b7343c123ab4452a2b1d1cf9863c96ab6de0f85c05c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 9688 bytes

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