Malicious PDF — malware analysis report

Static analysis result for SHA-256 cceed1ba327a7828…

MALICIOUS

PDF

39.9 KB Created: 2020-08-19 19:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ceb65f399febe995b0d63f32f880e2 SHA-1: d79030a32145587f9363d461eee3a4f324e5cf08 SHA-256: cceed1ba327a7828307a620a95724a3e02cd948c0d07ff5009d666374e1ece4e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to shopify.com domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains text related to 'Diy bead roller sheet metal' and the authoring application, which appears to be a lure to disguise the malicious intent of the embedded links.

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=diy+bead+roller+sheet+metal
    • http://files.stclementofstamford.com/uploads/1/3/1/3/131378838/soperoburekurobexuv.pdf
    • http://files.erinboake.com/uploads/1/3/0/7/130776718/maxul_zefanenumu_ruxuxotevar_jazomagudigem.pdf
    • http://files.kirtansongbook.com/uploads/1/3/2/8/132816107/lukodosupivavoj.pdf
    • http://vakiz.georgianhighlandshoa.com/uploads/1/3/1/1/131163601/bejalalorijapez_ladetip_vokesewerela_palarazir.pdf
    • https://cdn.shopify.com/s/files/1/0438/2287/4781/files/que_es_bienestar_social.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/hamachi_server_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78539107281.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/92554400891.pdf
    • https://cdn.shopify.com/s/files/1/0432/2131/9839/files/cataratas_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8474/files/digital_electronics_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/pharmacologie_de_l_appareil_respiratoire.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/76477400629.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/laketokulijubinun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/kupumosawogure.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/lituberuselonexekana.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/badinage_bozza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006004.bin
2a137501f891d2d011666a4b43ba8e4bbe81c5965ffcf365b6b853bc4957d9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6004 5304 bytes
font_01_sfnt_off000071df.bin
606e251b13949add06a028b4c9fcddef41c155707277fde75c8e1ab102955d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 9676 bytes

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