Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25622813abd3535…

MALICIOUS

PDF

35.3 KB Created: 2020-09-22 21:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ff50907794585b3398073255ef6069 SHA-1: 1ff209bbc3153b7dbd6b47605b58d0333507a6d2 SHA-256: b25622813abd35350869a5542164cdc00ab7cdf690a415dc6abf042a95242741
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. One critical heuristic specifically flagged a link to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that align with the heuristic findings, suggesting a social engineering tactic to drive traffic to attacker-controlled domains.

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.me/wix?keyword=genetics+since+mendel+worksheet+answers
    • http://files.tolgarengineering.co.uk/uploads/1/3/1/6/131637889/80f45b85.pdf
    • http://files.narianastarsia.com/uploads/1/3/2/6/132682936/7f72cdf7d7c.pdf
    • http://kemive.shoalbaysportfishing.com/uploads/1/3/1/4/131483418/sazowib-ritaz.pdf
    • http://wozotax.wcastl-ctl.org/uploads/1/3/1/1/131164312/cd81d9.pdf
    • http://fulagiv.doulasofomaha.com/uploads/1/3/0/8/130814328/vitolapatipamesadimu.pdf
    • http://files.workingathomenews.com/uploads/1/3/0/7/130775916/dedexosanipumo.pdf
    • http://zepolito.jacquelinenicholls.com/uploads/1/3/1/6/131607163/nowasob-wumapevi-kofuli-zuxin.pdf
    • https://1228d351-9c53-447d-9156-c25da44d31eb.filesusr.com/ugd/c7ef1a_7cb92f2126c14e08be2e0bb8a4543e42.pdf?index=true
    • https://42718c09-276b-4141-a7f4-bfe9993d62b4.filesusr.com/ugd/a18aa6_ce822d0e9cb94a9ebd5164d2cfe1e01a.pdf?index=true
    • https://709b7256-442c-4891-af4c-a26dcae3467c.filesusr.com/ugd/0af078_1b832ed93f1b41e5a8cd499f56e89998.pdf?index=true
    • https://294c21a0-8f34-4803-b464-d5d765480a22.filesusr.com/ugd/12f4eb_a3a3cdf7f8114ff48c97e05b1a9f712f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/atul_prakashan_books_diploma_civil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/kilebajezedo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044a8.bin
6bbb69c00b157eec3ee329a968c69109ee3e66eee1263895147705201b9d6273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44A8 5156 bytes
font_01_sfnt_off00005611.bin
8fb1477b4f8e0ab2dcf95348a11c94c9ba66a43e9ff927c75d418ca33dfb4df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5611 8276 bytes
font_02_sfnt_off0000725d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725D 4324 bytes

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