Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5d38b5d2c8a374…

MALICIOUS

PDF

41.8 KB Created: 2020-08-17 03:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0acaafde4471e33d448815cfa795f351 SHA-1: b5dbf84449230918180b06cca49fc4b4fcb523bf SHA-256: 3b5d38b5d2c8a374889567dc8befcabd54df960cb389e0dd56e99424ba49756a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download for 'adb drivers free for windows 10'. This link points to ttraff.ru, a known malicious redirector. The document also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=adb+drivers+free++for+windows+10
    • http://files.mylunarsign.com/uploads/1/3/1/8/131857482/6fcae3.pdf
    • http://fososolul.sleeptalkingbaron.com/uploads/1/3/1/4/131437623/727160.pdf
    • http://files.milltownmonitor.com/uploads/1/3/1/4/131437599/zoketupar_nejokosujot_bafoparuwanotot.pdf
    • http://bowopivu.edmotivate.com/uploads/1/3/1/6/131637309/6198845.pdf
    • https://cdn.shopify.com/s/files/1/0437/8640/4000/files/sahih_bukhari_sharif_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/sebufuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/dosoxukekeputerasovuwula.pdf
    • https://cdn.shopify.com/s/files/1/0439/1131/5611/files/kannada_vowels_and_consonants.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/boondocks_episodes_free_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/kifupisokumubowojuxexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4427/files/nomomonosezamel.pdf
    • https://cdn.shopify.com/s/files/1/0439/1708/2792/files/kolivami.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/43054664815.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/91479702782.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/nivonamisokonizabewibejo.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_off00006215.bin
6dc0024cd8becd31aed1f3ef6ab778a4d99c4dd7ba21db7baa4a9496672f0dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6215 5132 bytes
font_01_sfnt_off000073bd.bin
71182be68816bbe74018625b8b48e5e2c33a203dfb1d9a2c23374113ab17ca54
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BD 11576 bytes