Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fe88248a71c680…

MALICIOUS

PDF

37.2 KB Created: 2020-07-08 17:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5a290891e77198177568aac0125828 SHA-1: 9e35cbf72ac924294cfd7f2902e6455aa8036481 SHA-256: 27fe88248a71c680ff7bf9427813690a3d11a7071a0993dcafe2fa6948ba37f3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded URLs, many of which point to link farms designed for SEO poisoning. One prominent URL, https://ttraff.cc/wb?keyword=worksheets%20for%205%20year%20olds%20maths, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains keywords related to educational content, suggesting a lure to disguise malicious links.

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.cc/wb?keyword=worksheets%20for%205%20year%20olds%20maths
    • http://files.thetrillofmusic.com/uploads/1/3/1/8/131856950/8c5bb3773.pdf
    • http://files.thewallssager.com/uploads/1/3/0/7/130775846/zofudaxeluzun-vogake.pdf
    • http://files.hannumagency.com/uploads/1/3/1/4/131409127/jokumugumab-xemujoma-lelawokit.pdf
    • http://files.niassestudios.com/uploads/1/3/0/8/130874318/b919e96e4ba.pdf
    • http://files.romanhoering.com/uploads/1/3/1/4/131437648/69ef1bf27211dd.pdf
    • http://files.faniehose.com/uploads/1/3/1/8/131871622/zepafidurilasoxudu.pdf
    • http://files.householdarchaeology.org/uploads/1/3/1/4/131438840/e132fc.pdf
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdf
    • https://ganesesuf.files.wordpress.com/2020/06/vubarubedule.pdf
    • https://degexiz.files.wordpress.com/2020/06/65456986147.pdf
    • https://xevekebi.files.wordpress.com/2020/06/20646131014.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.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_off000052f2.bin
94d37ee9dde87c3897cc350bcb4c220b1095b70a4cdfe3b85c7a615c100135fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52F2 5084 bytes
font_01_sfnt_off0000645c.bin
7bb459c0570d689708bf6cfb3a77dc77a8e64df907b1de471b6aaa07e5eb1af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 11020 bytes

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