Malicious PDF — malware analysis report

Static analysis result for SHA-256 e198de0ed9c50944…

MALICIOUS

PDF

57.5 KB Created: 2020-08-12 06:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1832666072804673a23e99b1010ba05a SHA-1: 0aff5adf8a091da63c5cd72e07a96754b611c651 SHA-256: e198de0ed9c509440738563f5e594bb1b67b2154dc6ba9c4df83ed8d96020853
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that masquerades as an answer key for a math textbook, but directs users to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. The document body itself is heavily obfuscated but contains the malicious URL.

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=big+ideas+math+algebra+1+student+journal+answer+key+pdf
    • http://files.rathfrilandmotorclub.co.uk/uploads/1/3/2/3/132302913/zomawuzivoludi_petusol_mufawukemur_xitedelufukojob.pdf
    • http://kekotova.abbalonga.com/uploads/1/3/0/9/130968973/787369.pdf
    • http://files.byhisgracehymns.com/uploads/1/3/1/4/131453188/3017069.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/gajuzobidevuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/electronic_library_project.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/48070892240.pdf
    • http://files.herb-and-dew.square.site/uploads/1/3/1/8/131871597/5075157.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/98351570911.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/amelie_vals_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/cfd_in_fluid_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/66040781165.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/java_unreachable_statement.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/jokemiloke.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/11809619686.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/61006238791.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/lineare_gleichungen_mit_lsungen.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_off000096ed.bin
a9fed53f28400dd368d1c0bc6083e00a2db92693be5249b331a8ac116af6c16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96ED 6032 bytes
font_01_sfnt_off0000ab71.bin
a7c3d95246d8ed19c287afb555ad95c440562ca39a010e44ecf10e580895c121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB71 14268 bytes

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