Malicious PDF — malware analysis report

Static analysis result for SHA-256 846ec4865ceae216…

MALICIOUS

PDF

36.2 KB Created: 2020-08-22 10:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e2cb01453694cce3995e72092e5042 SHA-1: 5fe0faa18900e8674d709411ece192bc7cb0b781 SHA-256: 846ec4865ceae21690a0eb3328943c032003c9cb25af78016c042d949defff12
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service that is associated with malicious activity, specifically attempting to deliver a Google Drive APK. The document also hosts a large number of external PDF links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly indicates maliciousness, and the embedded URLs are the primary indicators of compromise.

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=google+drive+apk+free
    • http://nulifofa.rv-14a.net/uploads/1/3/0/7/130775350/f87dd29.pdf
    • http://tenagos.flagstaffscies.org/uploads/1/3/1/4/131454807/8aab1bae87b8c0.pdf
    • http://files.vincentmasseyoed.com/uploads/1/3/1/4/131406826/lonaz-towaridudawezi.pdf
    • http://files.techshark.org/uploads/1/3/1/6/131607163/7456566.pdf
    • http://files.aps7.com/uploads/1/3/1/3/131379567/sabisipolunox-kugosogemon-safilikezidazob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8951/1071/files/sekutibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/67458542313.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/janiborewago.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/30425941185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/nadigepiju.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/xapitoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/danusepediwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/wulipadilaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/fazeken.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/mabuzisut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/koneman_s_diagnostic_microbiology.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/hssc_annexure_e1.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_off00005029.bin
7b38e79bcae934fd5c6a6a401893985794c92b25e107ac0a2d8f45e655d259f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 5184 bytes
font_01_sfnt_off000061f4.bin
bc4964b260bee8988b7d592d44a103a068154625fc9027bfb307d577a9c6b36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 10000 bytes

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