Malicious PDF — malware analysis report

Static analysis result for SHA-256 2801e0948327ee0a…

MALICIOUS

PDF

33.8 KB Created: 2020-08-14 10:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f44fc62a0515b6c6405550d72aae1511 SHA-1: 24bff5f29535fabe671edce123bf341e46bfe032 SHA-256: 2801e0948327ee0af2866b23ce17cf58494f9b9a77b0815918895ae093a30ca4
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a worksheet download. The ML classifier strongly flagged this PDF as malicious. The document body also contains numerous links to external PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for 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.ru/pify?keyword=writing+linear+equations+worksheet+kuta+software
    • http://files.dlsu-soe.com/uploads/1/3/0/7/130740213/forulabutozo_kuxomazosego_moluga_wobalopafe.pdf
    • http://zaputif.edwardmcfarlane.com/uploads/1/3/0/8/130814575/xoromakuvivurav.pdf
    • http://sanuw.wrinklecreative.com/uploads/1/3/2/8/132814930/sabojobuwufefov-damigadidukes-ximuruwabozaj-darerabawafero.pdf
    • http://files.handhtacklellc.com/uploads/1/3/1/3/131381464/suwadegawewube-kawosijosabut-xemojirajepig.pdf
    • http://vagesed.souland.org/uploads/1/3/1/3/131383790/dugenuwipuzasa-kevejapok-vijip-lapenine.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/terudumefivezuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/zisopowugasolejon.pdf
    • https://cdn.shopify.com/s/files/1/0447/0643/1130/files/biomedical_engineering_syllabus_anna_university.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/daxata.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/geginubali.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/72531996135.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/wudunetajazuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/57650185976.pdf
    • https://cdn.shopify.com/s/files/1/0435/8973/0472/files/jodute.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/gosefagovawera.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/gadezinojofozegarolos.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/firurilolizesobajexar.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_off000048e8.bin
bf136ebb9c3d16e574df810aa68e19a484347b2d6d655dd1019fd4beb058111e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E8 5324 bytes
font_01_sfnt_off00005b1a.bin
b39aa8a393cba1981f8aec1bf390d1b608a4a0dcff00ee8449a3256787bc4a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1A 9100 bytes

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