Malicious PDF — malware analysis report

Static analysis result for SHA-256 615d978654037536…

MALICIOUS

PDF

51.9 KB Created: 2020-08-04 21:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef956f0fea4aa213a95d0b8e28efec1 SHA-1: 3ea9611b1a2c2c1536d658c670e79db8dd6c4154 SHA-256: 615d97865403753679365bb4f152847e6f00ce513db99a1ff762df0b6a93c634
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links further indicates a link farm or SEO poisoning attempt to distribute malicious content.

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=amoxicilina+clavulanato+eurofarma+bula+pdf
    • http://files.keepdivealive.com/uploads/1/3/1/4/131453592/e0b38208b324ffc.pdf
    • http://files.changlaoshiclassroom.com/uploads/1/3/1/8/131857758/5489288.pdf
    • http://files.bluu.zone/uploads/1/3/1/0/131071114/nowesuzunubemav.pdf
    • http://vuxel.eternaltimberanddesign.com/uploads/1/3/0/7/130775823/kajuwezatozajiwid.pdf
    • http://files.winchad.com/uploads/1/3/1/4/131406365/ronufesipedawis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/26934291583.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/fimewunakim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/sexasoravijofafujef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/jutifarexepugekumok.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/zoxeliwavovisuzanonin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/28802660817.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/diromarixajotepapip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/89239226144.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/25201437859.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/characteristics_of_research_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/98305998458.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_off00008a31.bin
3d7c03fddd9b1e74dfc6be6b16a14cce31cae09ee03f7dde34c79b0314d2953a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A31 5380 bytes
font_01_sfnt_off00009c6c.bin
e574e9454fe6237e1ffab88d001a18bd58ed31771a71f0e020c864c63c4ff9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6C 11980 bytes

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