Malicious PDF — malware analysis report

Static analysis result for SHA-256 091287e18a0c8033…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 23:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b5b10baca92856b14900f4234dbd24 SHA-1: 953d4fcce7205c1869e584cea49bc45c769e7666 SHA-256: 091287e18a0c8033ab994e871866d41ed4df9640d4c6cbd48e90d746c4453814
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify and other domains, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=homonyms+worksheets+for+grade+2+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'homonyms worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent.

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/pify?keyword=homonyms+worksheets+for+grade+2+pdf
    • http://files.nancypanko.com/uploads/1/3/0/7/130776735/0942f7f48cf56e.pdf
    • http://popubugil.massbuyinggroup.com/uploads/1/3/1/3/131380600/doridifulelefa_watufikav.pdf
    • http://files.australiantimberflooring.com/uploads/1/3/0/7/130775672/jinamozuzur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/33539291183.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/zibepasilevafisututig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/mifolosazamivelusig.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/sap_merchandising_and_assortment_planning.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/blw_alimentao.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/difference_between_anthropology_and_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/bavewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/82591500813.pdf
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/google_photos_api_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5318/files/rikesowowokakube.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/fatigolamoxejugib.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/daluxenopifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/47764709192.pdf
    • https://cdn.shopify.com/s/files/1/0435/6715/3313/files/abnormal_psychology_an_integrative_approach_8th_ed.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_off00005078.bin
715d0abe03cc02ff358ba6e87c920769575cbeb80a5541f476b8445d8e64478a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5078 5516 bytes
font_01_sfnt_off0000631b.bin
449050097ad87b3fbf303366f270e012a53c94d296f485c2392eb55f4e19a6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 9760 bytes
font_02_sfnt_off00008476.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8476 4324 bytes

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