Malicious PDF — malware analysis report

Static analysis result for SHA-256 0091dc2091c7d857…

MALICIOUS

PDF

67.8 KB Created: 2020-07-30 15:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ae317e71e5e7ee29c9873deed81a15 SHA-1: 57c2e7ac1fa03439920f521b67379350d39880f0 SHA-256: 0091dc2091c7d857412bc64d6a10052163ac848bef5e5f51619177fe70251ca4
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an 'Amsterdam rail map pdf'. The presence of numerous links to external PDFs hosted on various domains indicates an attempt to distribute malicious content or engage in SEO manipulation for phishing.

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=amsterdam+rail+map+pdf
    • http://files.commonplacebooksftw.com/uploads/1/3/0/8/130813644/7589179.pdf
    • http://files.blueseabirdclaydesigns.com/uploads/1/3/1/3/131383456/mumewujototeka.pdf
    • http://files.billhoganphotography.com/uploads/1/3/0/8/130874627/9332220.pdf
    • http://files.stohrdesign.com/uploads/1/3/0/7/130739552/8112872.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/baxogutimisunoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9966/files/juzufixilobowomisewuduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6762/8950/files/98977672137.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/25359249976.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4977/files/rederixulesodamavaru.pdf
    • https://cdn.shopify.com/s/files/1/0438/0445/9168/files/79518182435.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/dekuwejofodezapujiwomid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/wetewuguxejeridovenuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/16074545646.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/zagenaxijadenewidusodat.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/69174792628.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_off0000ccea.bin
bb84e762a40711033c8e8f0af02023a4eb412d7940e67efcf4f844e9c09d3caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 4748 bytes
font_01_sfnt_off0000dcff.bin
35c7f75829653bfb92e4475d995493668952e6aa6c9f5dc83625c84b0a692f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10848 bytes

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