Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c1a7b0abf84295…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 21:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fdb92f35b215d9e484b0e07c8c330a7 SHA-1: a83961c916c722ac1cc763e830ef8604fd074c34 SHA-256: 76c1a7b0abf842952013551cf398cd8a9960a993ad15e0119fcaad386bcecc1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination and potentially deliver a malicious payload. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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.cc/pify?keyword=alsco+uniform+linen+service+ltd
    • http://files.thepuginsociety.co.uk/uploads/1/3/1/3/131384025/5049384.pdf
    • http://files.stfrancis-stambrose.org/uploads/1/3/0/9/130969623/9250928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/miritijifulivolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/alcoholic_fermentation.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/jeninesezelef.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/jurnal_asma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/tegexade.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/medical_bacteriology.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/nopifupumoziledovekuwib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1590/files/vopojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/subtract_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/47227273837.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0445/files/hk-_47_quotes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005837.bin
f39775e056bc5f4246c22ebea7b895b5cfb2653dd58b85df372bca614b8359c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5837 4888 bytes
font_01_sfnt_off000068bb.bin
616c0d82d38ff4ec5a25d52576c9d905a7478a45ac3bef570528ea4802e91f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 10268 bytes
font_02_sfnt_off00008bc1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC1 4324 bytes

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