Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ff313d4ac168fe…

MALICIOUS

PDF

45.5 KB Created: 2020-08-07 05:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51fdc87543c506de79749571cbf3cb4 SHA-1: 1a7016a0966b7671524cc29e1360643bd52085d8 SHA-256: 71ff313d4ac168fea0af81bda0dd3666a800c8b88c9480801d356eea6beca693
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised within content that appears to be a job description. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=customer+support+executive+job+description+pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/1/6/131637919/vapurisadeneju_votatujitonufi.pdf
    • http://files.pongdeelab.org/uploads/1/3/0/7/130775987/vubad_sogab_xiredatadevipoj_fuzisora.pdf
    • http://files.bluu.zone/uploads/1/3/1/4/131454766/8445616.pdf
    • http://files.circledfarmkennels.com/uploads/1/3/1/3/131384229/4903084.pdf
    • http://files.thrivedirecthealthcare.com/uploads/1/3/1/6/131606874/8433228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/mozegoxivogikadodidika.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/ruvejejolusuwurimufijeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/23957083316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/ladevakevofufurul.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/xabarofuloferazede.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/fleetwood_pop_up_camper.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/dolabusof.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/17169320250.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/malukusagaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/rutakufonef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5225/files/28581756752.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/mekimo.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_off0000753e.bin
4c2d6a65bcaa9f83361ee7226baa37cf4ec6cbe4c3b53b8ec7c073502793d1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753E 5308 bytes
font_01_sfnt_off0000873f.bin
7eec717ee2289e4b04eafb8f459e2acb7755d569b3c91a05e6a76ffaf73964ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873F 9844 bytes

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