Malicious PDF — malware analysis report

Static analysis result for SHA-256 2548e04a29b03584…

MALICIOUS

PDF

58.2 KB Created: 2020-08-13 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 247346e0f0cae9c816716ec0f59293fb SHA-1: 448dcdd496d018894e6ee4aceee7941cac8ba996 SHA-256: 2548e04a29b03584d1f3aa53c583421b23728c499102b67a2e0420f6e192dc19
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'acidification of urine' and the malicious URL, suggesting a lure. The presence of numerous links to PDFs hosted on Shopify, combined with the malicious redirector, indicates a link farm or SEO poisoning attack designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=acidification+of+urine+pdf
    • http://files.organizingbyali.com/uploads/1/3/1/8/131856032/tadolarawat_juminomebe_fozidelidusozo.pdf
    • http://files.aampmuseum.org/uploads/1/3/1/8/131857970/gewudivofuxovirer.pdf
    • http://files.risalah.ca/uploads/1/3/1/8/131856186/608528cfd2.pdf
    • http://files.atouchofsilver2.com/uploads/1/3/2/8/132814898/7179347.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/zelunixugixag.pdf
    • https://cdn.shopify.com/s/files/1/0439/3366/3400/files/risk_of_rain_2_predatory_instincts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21883700101.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/ase_aortic_stenosis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4886/files/83232611227.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/93230201148.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/bosimepipod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/nuresekefonud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6832/6042/files/athletic_body_workout.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65925238695.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096ac.bin
188a6cfd2f23e59667ca7ad39f468c2517b3006a47882c0dd775532223d18e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AC 4808 bytes
font_01_sfnt_off0000a704.bin
047ebed4da530d39f018fff6588449861c3cc12e294351e6efe5a1c4a6403ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA704 11300 bytes
font_02_sfnt_off0000cdae.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 4324 bytes

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