Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee475200614e91d…

MALICIOUS

PDF

45.3 KB Created: 2020-07-28 18:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f74cc78330111c96d9ee6c1b53852d8 SHA-1: 9d0c4fa4a1fad8f3c3f09226066bc355b862ee41 SHA-256: eee475200614e91d9fc021fdfb798c47f2e7606e1252886fcb06d6088fe1fe71
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, suggesting the content itself is not the primary lure. The primary attack vector is likely the embedded malicious links designed to lead users to harmful sites.

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=vowel+and+consonant+rules+pdf
    • http://files.astiquesalon.com/uploads/1/3/0/7/130739616/fotoderiviw.pdf
    • http://files.chineitsangnow.com/uploads/1/3/0/7/130776589/3490890.pdf
    • http://files.amysteeleillustration.com/uploads/1/3/0/9/130969048/8476925.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/97292322634.pdf
    • https://cdn.shopify.com/s/files/1/0440/1224/1046/files/31410323265.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/rotetirabefeguwodewoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/89426177330.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/91788190834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0436/7020/8662/files/fijafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/70921641707.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/tobezipowejogop.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/97877082394.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/1131696718.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/nonufelivoz.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007536.bin
16f7c9c4a422227f8c070008d03a371314d44df119f64b1b03a6a598c59170fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7536 5040 bytes
font_01_sfnt_off00008675.bin
9644b94cb6fa59f59744d3279f84d99812f0fc0cccd2e1a38ffd605ea1641668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8675 9792 bytes

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