Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5f1194bc93889…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 16:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13047d8aebcc23f2973b1f339e371dc9 SHA-1: 1ad1e0a1b2375e95be6f53a9b15b8b3c8a35d2f4 SHA-256: 13b5f1194bc9388992f24e223ca0990b0b211a839a51808dec8ea09ca84ce473
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes a URL that appears to be part of this malicious link farm. The presence of many external PDF links suggests an attempt to manipulate search engine rankings or distribute malicious content through a link farm.

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=brown+bear+brown+bear+in+spanish+pdf
    • http://files.edgewater-tenant.com/uploads/1/3/1/3/131398195/bigivaf_dozagogivo_xufegurujulatil_pinigedolaj.pdf
    • http://files.caringheartsunited.com/uploads/1/3/0/7/130776726/fabat-jebuporitad-mukuledidiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/jovuwamom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/visual_studio_2017_android_emulator_is_slow.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/folijipegemilizozomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/13848487087.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/rasafazaduxonine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/kulibameji.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/aidin_salih_yitik_ifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/vazamidarebepadoxodara.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/wedding_magazine_cover_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/55142770651.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/dorapijixanu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/java_api_documentation.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_off00005ade.bin
a1e64a4878593ebf7ca8f86499a8ebebba12f33f66f88f1ae170cb441c478f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADE 5376 bytes
font_01_sfnt_off00006d2c.bin
20109a82f9e510723fbf2a98bdf1789b47179925dd01c6f2bd3ca89d668cc962
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2C 10332 bytes