Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52d08c9d7db1fa5…

MALICIOUS

PDF

49.5 KB Created: 2020-08-12 07:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e01fe1e347240f84a02b1a69038ded9b SHA-1: 2bc1ddbf32ffc68b8c1d6a4eb97ca1ec6859184a SHA-256: a52d08c9d7db1fa548667a2603dd22c082b038c4c81cfce7d214c3b73d94156b
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.ru', disguised as a free calligraphy workbook. This indicates a link farm or phishing attempt designed to redirect users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=calligraphy+workbook+pdf+free
    • http://files.agonyopera.com/uploads/1/3/0/8/130814208/lumekavowubo.pdf
    • http://files.mylifewithbradleycooper.com/uploads/1/3/0/8/130814774/1899a3.pdf
    • http://files.justjollylife.com/uploads/1/3/1/4/131437491/2697858.pdf
    • http://files.mahoneyadvancedtraining.com/uploads/1/3/0/9/130969254/fowevajin_xalipamonapamon.pdf
    • http://files.portugal-spainmarinesurveys.com/uploads/1/3/0/9/130969082/b7162.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/folunuzetalaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/24278762385.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/fupexifuvalabilirat.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/myers_briggs_16_personality_types.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/5338755763.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/nuzozew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/wow_classic_shadowcast_boots_item_id.pdf
    • https://cdn.shopify.com/s/files/1/0431/7000/5156/files/lerulumepulisizuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/gotogedozigepurakijuwop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/gradiente_albumina_suero_ascitis.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/
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/gr

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf3.bin
3829d34b051b48cd29b28f4f47fe043374335a13bce9d58f02deb495f5ea0d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF3 5428 bytes
font_01_sfnt_off00007f79.bin
d55cff4be3152a914279c65e1e19a2a65e379ef61aaaf3cf4c9616c4c4888051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F79 10468 bytes
font_02_sfnt_off0000a3a6.bin
d4c4feb8951055c2fa9bcdd55af7a36c85e906000362d0091f30ac23a55c13ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A6 16192 bytes

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