Malicious PDF — malware analysis report

Static analysis result for SHA-256 271c652917fec01b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 12:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf53d945bbf1efa8a2947182e0f71c7 SHA-1: d7120e910c6b21547b06f10e8030feb2d9c9db14 SHA-256: 271c652917fec01bf67eeadf14b0adc6b4174145f9071897a1b0018b3d06a726
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=bill+winston+pdf'. The presence of a mass external PDF link farm, with many links pointing to various domains, suggests an attempt to distribute malicious content or conduct phishing operations. The document body, though heavily obfuscated, also contains the malicious URL.

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=bill+winston+pdf
    • http://files.thriveglenville.com/uploads/1/3/2/8/132814400/0c124ef.pdf
    • http://files.thaikitchenames.com/uploads/1/3/1/4/131406592/7322853.pdf
    • http://files.sumterchristian.org/uploads/1/3/1/1/131164519/3167360.pdf
    • http://files.bridgeportrodandgunny.com/uploads/1/3/1/1/131163737/ditixip-romekoxazotuzob-riwexeribezejad.pdf
    • http://files.deborahjonesyoga.com/uploads/1/3/0/7/130775171/6009060.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/14800621055.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/ravisakapumozuxabesirakuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/75277651446.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0436/8531/4715/files/limit_order_robinhood.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6260/files/tuwoguzejabeduzupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/refed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/bevigiwemunidulevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/12120736218.pdf
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/73524092746.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000652f.bin
1b52bc6977f9531c8ddb02afccdbf1603bb43bfe70272bac4f3ba1be59fa5fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652F 4872 bytes
font_01_sfnt_off000075f1.bin
666f735c37815548072e4d5373602600e318be0ea9530dc14b2427e08ec07dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 9844 bytes

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