Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2c357f7a5831ea…

MALICIOUS

PDF

42.5 KB Created: 2020-08-03 12:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2517d00720603d350fd00d51edfa97b SHA-1: b1c4a955650b5a62710541bf76ef516434bbaeb9 SHA-256: 9e2c357f7a5831ea4160db014895866a66e9d504cac0a22c4f1168288cf69c05
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary malicious URL identified is ttraff.ru, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a book download, reinforcing the lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed to distribute malicious content.

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=categorical+data+analysis+3rd+edition+pdf+download
    • http://files.wapahandmade.com/uploads/1/3/0/7/130739910/9368337.pdf
    • http://files.splatart.org/uploads/1/3/1/6/131606789/6258539.pdf
    • http://files.cheshireneuroactive.org/uploads/1/3/1/4/131437669/5257187.pdf
    • http://files.48thglasgow.org/uploads/1/3/1/3/131398117/657861.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/lowanunoxomepotebak.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/kofazusexevepen.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/jivotosuposovevorariku.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/megubafekepurika.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/51449974418.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/74800824281.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/active_release_technique.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/cox_cable_macon_georgia.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/30343358976.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/twitter_api_keys.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/kaspersky_geek_squad_install.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/88065788986.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_off0000671e.bin
c6f03dcfe8ca70be6c3ff208254aff42bd9fd4fd33c622afc6ba3146a35d9921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671E 5584 bytes
font_01_sfnt_off00007a41.bin
4060739ae1c1d0b6efebcc812b8e483b7df674ea00bf60dd9f14553c8b2fdce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A41 10080 bytes

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