Malicious PDF — malware analysis report

Static analysis result for SHA-256 7338b5c170063970…

MALICIOUS

PDF

39.7 KB Created: 2020-08-10 18:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f59cc7e1121150ec1c773e7ebb0429 SHA-1: c22f9c05cc6150b1151c473c68cafdde0de7dba5 SHA-256: 7338b5c170063970690779fbc936be349f2ff3d83e1fe1df79d7ba40256daf78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=beauty+for+brokenness+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links further supports the malicious intent.

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=beauty+for+brokenness+pdf
    • http://files.harrisonandellison.com/uploads/1/3/1/8/131856883/vetiwuvuvuni_kosewaduzasusab.pdf
    • http://mivaje.grammar4.mrslambsroom.com/uploads/1/3/0/8/130813612/1848516.pdf
    • http://files.sashatepperstewart.com/uploads/1/3/0/7/130775436/mirupijujupisi-rewoboj-nigexi-fifomu.pdf
    • http://kipob.davertskate.com/uploads/1/3/0/7/130775971/tamugo-lapoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/26737355830.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/wamuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/23637716601.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/21918853594.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/1907397820.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/48126675828.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/pafeti.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/86223998102.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/30583237676.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/minecraft_enchantments_commands.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/pedukajomes.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/jitimegofasizasesogawufe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/company_analysis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce5.bin
84475ef0223eff1977d86bbf653c563dd91b113fb661706546ce36952c70d08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE5 5356 bytes
font_01_sfnt_off00006f31.bin
fa9cdef73c2003b106c920a24a946ad7c0a15db5552896b7a13e3c232cc6186e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F31 10192 bytes

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