Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d42844468df537…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 21:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33f687f8e2430e937e1a571480c78be SHA-1: 2ad357d31112ac09ea3867791d91f8b66034a1d4 SHA-256: 76d42844468df537adef07bee024de7532e2bb19cbabf1a31ecd8c34628cadcb
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector service, ttraff.ru, which is likely used to obscure the ultimate destination of the payload. Another heuristic indicates a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious links. No scripts were extracted, but the presence of numerous links and the redirector strongly suggests a phishing or malware distribution attempt.

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=academic+writing+english+alice+oshima+pdf
    • http://files.holmesscience.org/uploads/1/3/1/8/131856270/puxugafujewulo-kufupubal-gofaj-fipaluzole.pdf
    • http://files.elmschoolofrealestate.info/uploads/1/3/0/9/130969004/ratag.pdf
    • http://files.mijblaxby.com/uploads/1/3/2/7/132710797/fefirozulun-rulujudo-bosajipobatin.pdf
    • http://kajexe.nextlevelgamex.com/uploads/1/3/1/4/131407406/57e171.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/94839117961.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/xezekofumude.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8518/files/64482694947.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/aquarelle_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/58817950460.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/xiniluvobijawumugerib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/velaxevaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/surujux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/59463847202.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/vojemug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/nobody_s_perfect_lyrics_hannah_montana.pdf
    • https://cdn.shopify.com/s/files/1/0427/7442/9852/files/3293493110.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/gowebivilodaruvajenuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/33880267204.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_off00005a23.bin
8330707967f1f54955fe5fcccd5c0eb5d8c2f94aaf57f0f4f6f33d56edc107f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 5652 bytes
font_01_sfnt_off00006d37.bin
633246771cffc6e91beb42caf3d562244f2386513835483988def4160459c3ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 12492 bytes
font_02_sfnt_off00008ea1.bin
2f879dc135d1dea52d982d49b713525688c1f86d3ace369e38ac9d2b8bb6f964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA1 9876 bytes

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