Malicious PDF — malware analysis report

Static analysis result for SHA-256 9936ca6af04b82b4…

MALICIOUS

PDF

57.6 KB Created: 2020-08-09 18:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 605d26f01e2fe694ca0094f27c5694ca SHA-1: e4847457705f20a535038e02cbe3f76a3de9d0f8 SHA-256: 9936ca6af04b82b47f98a3ea35cd4d3b9a91c7bdf3e8cabc4ba104177bd537a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=agonistas+y+antagonistas+de+gnrh+pdf In PDF document text
    • http://files.nugierfroom.com/uploads/1/3/0/9/130969887/xejekilas.pdfIn PDF document text
    • http://files.thecarissafoundation.org/uploads/1/3/1/3/131398177/c6821cb81.pdfIn PDF document text
    • http://files.thesyncretistrealm.com/uploads/1/3/1/3/131384567/ce38869e6d.pdfIn PDF document text
    • http://files.gobigt.com/uploads/1/3/1/3/131379012/bf33c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/80493156949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/10241576673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/tipos_de_predicado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/tokusazorusapinager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/xopamufivovanas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/kixaga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/takefovufosimapud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/parasyte_the_maxim_episode_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/pevufepexuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/jobirixefikovovilolisi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/87909118461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/35547699736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEF 5360 bytes
SHA-256: 8e914019509998213648d09391ae598b0621f4870c21952d45585b3172de0b49
font_01_sfnt_off00009136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9136 15668 bytes
SHA-256: a188686b549e1b641632091447fc3cb534170bcc387150e6c222c0534086dcb7
font_02_sfnt_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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