Malicious PDF — malware analysis report

Static analysis result for SHA-256 035532de71f1c911…

MALICIOUS

PDF

39.2 KB Created: 2020-08-04 13:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4c007170b96634987a3bd6b65c5eea SHA-1: f4e936ed2a766b2ed64b9f0db4cb53fa1eacd91f SHA-256: 035532de71f1c9113a99b15b5241912ab5ead3061dcfe5e664e4d1ac270c8398
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=evidence+based+medicine+book+pdf. This URL is presented within the document body, disguised as a link to a medical book PDF, indicating a phishing or scam attempt. The presence of numerous other PDF links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. No scripts were extracted, but the primary attack vector is the malicious link.

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.com/pify?keyword=evidence+based+medicine+book+pdf
    • http://files.aoa-ne.com/uploads/1/3/1/0/131070678/jetuz-nidulamiboker-lepasabumepir-lepidapegun.pdf
    • http://files.nonprofitjourney.org/uploads/1/3/0/9/130969404/mezedov.pdf
    • http://files.greenmannurseries.com/uploads/1/3/0/7/130775741/f667202b.pdf
    • http://files.stmarybythesea.com/uploads/1/3/0/7/130775786/kitibugofigedu-gugoxawokef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/71244272030.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/9020155636.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/lisitajesizaput.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/sovusasowukajalux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/wumudipikoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/gafijiforozamiturepovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/86564430388.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/10847278054.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/periodoncia_carranza_10_edicion_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/66525270067.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/94266789533.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_off00004c60.bin
20eb7642730cbf40b08b0c65dc7645ad340339da98dfb9ff6e86f83297ff15b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C60 5100 bytes
font_01_sfnt_off00005d9c.bin
c17b045e6bbc95c6663ce4c6ba7e7fff810f712cef02be06e5d0ac728becc252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 10568 bytes
font_02_sfnt_off000081a6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 4324 bytes

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