Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7abad13ce623a6…

MALICIOUS

PDF

50.7 KB Created: 2020-08-07 00:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86d3bd33967b952d174a04ec41ebe50 SHA-1: eb6213e7dcbd809d5338eadb32385fe8f94caa52 SHA-256: 6c7abad13ce623a6cb918320e81c8b35d6c69e775bdd63aceb615f79c7097d36
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'maths teacher cv pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into clicking it. No scripts were extracted, but the presence of a malicious redirector indicates 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=maths+teacher+cv+pdf
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • http://files.tourtrax.com/uploads/1/3/2/7/132740594/zefoporifowez_mewikapunesoja_medorerex_bubakaw.pdf
    • http://lupuros.juabchoirs.org/uploads/1/3/0/7/130740178/46b36e969e8bc.pdf
    • http://files.advantureusa.com/uploads/1/3/1/1/131164185/944c18a09ad0931.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89352644259.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/microsoft_excel_formulas_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/52449031027.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/51527006100.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/topeto.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1910/files/52863388557.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/90727337518.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/74367503681.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/5329576807.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/9005/files/bazifugejabuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/31172097994.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_off000086ec.bin
7f3739896f795bc26ab387148f3406d693dffd88140b257ca87a15ef5c347191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 5276 bytes
font_01_sfnt_off000098f0.bin
1dbe77d4add413b2def76d64c8ee354fbbeb818cb3ff589941c7b2eaa4cdc02e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F0 10904 bytes

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