Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcaa08e0cec3359…

MALICIOUS

PDF

52.9 KB Created: 2020-07-30 14:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0610d7cd2709916e6261a7e0c1b83508 SHA-1: 4681a3616987a5d2f4a407fb43c7c129ed29f439 SHA-256: 6bcaa08e0cec335901a664c2d764e782ea7b156c8affa34d8ec52f6e93ce800e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious content or manipulate search engine results.

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=data+science+for+business+and+decision+making+pdf
    • http://files.fionapaterson.com/uploads/1/3/1/3/131381706/tutazu.pdf
    • http://files.careyyachtcharters.com/uploads/1/3/1/3/131380786/mafusaj.pdf
    • http://files.rwaconsultants.net/uploads/1/3/1/6/131607363/9866357.pdf
    • http://files.my-obr-opinionplatformsk.com/uploads/1/3/1/8/131858540/vevudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6155/7913/files/teteromuzomesabutexobijeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/90253373125.pdf
    • https://cdn.shopify.com/s/files/1/0433/5363/7018/files/wajedotodaworejunigob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/kenejezezojuxoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/80651653576.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/temosesoxekunazosagena.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/86283196182.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/zisafefetaxawix.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/21335889669.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/gikegagojigafudamewusivab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/8354182106.pdf
    • https://cdn.shopify.com/s/files/1/0440/7971/0360/files/fedagifugi.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_off00009074.bin
0629c73cc8dd4c0887ae5d2d72a645fda51a4b9bc5926a9cc8ae5d6297f5df86
pdf-font-stream PDF embedded font (sfnt) at offset 0x9074 5528 bytes
font_01_sfnt_off0000a322.bin
b8ff367766ee8f737aa5a1bc6342d34ed50d2a3791039ee787409897120d3e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA322 10080 bytes