Malicious PDF — malware analysis report

Static analysis result for SHA-256 74eeb013dda6aa5c…

MALICIOUS

PDF

46.3 KB Created: 2020-08-19 10:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c54967c8b6b137dcf77f708628ff58 SHA-1: ac82f11b45884da4af1376535bb18812ec93e409 SHA-256: 74eeb013dda6aa5c95ffc582be2137065d77b4c56679502660fdf126a79aac4c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though partially corrupted, contains text related to 'basic pencil drawing lessons pdf' and the malicious URL, suggesting a lure. The presence of many external PDF links further indicates a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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=basic+pencil+drawing+lessons+pdf
    • http://files.mrsdawson-classroom.com/uploads/1/3/1/3/131380213/82ad8784c19aade.pdf
    • http://fotadu.hoofandshoe.com/uploads/1/3/1/8/131871825/livaz.pdf
    • http://files.shpoppyshawnsshmokedcheese.com/uploads/1/3/2/7/132712661/493811.pdf
    • http://files.lowcreektattoo.com/uploads/1/3/0/9/130969034/kutokejuvekesij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/87093941790.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/pakafezosevidifuxiroz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/sozabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/32899773710.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/ios_6._1._6_jailbreak_no_computer.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/vewixufe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/8739574575.pdf
    • https://cdn.shopify.com/s/files/1/0436/8308/6489/files/caustic_3_hip_hop_pack.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/34820685872.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/dejozakijifowume.pdf
    • https://cdn.shopify.com/s/files/1/0437/3338/5381/files/fujugupiwejidixapokuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/margaret_atwood_testaments.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_off000077af.bin
bfbce97056a3cd31180c83990a5f9f5dd438b7950771ad995b7858758d7b4133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AF 5464 bytes
font_01_sfnt_off00008a5b.bin
095ed72e870ea526cdc1794fe7be7ab217b600cb3369fba084afe9180b0d9843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5B 9944 bytes

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