Malicious PDF — malware analysis report

Static analysis result for SHA-256 8890c4f1a5732c3f…

MALICIOUS

PDF

89.3 KB Created: 2020-08-18 19:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859e2f945417ac11f311d0d89f576df0 SHA-1: cc42be41478d897776f1961d23986ee36e33ccb3 SHA-256: 8890c4f1a5732c3f9f40cf54923189487552fd370c14f6c50be70c086dfce769
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to direct users to malicious infrastructure. The presence of numerous external PDF links, many pointing to benign Shopify domains, indicates a potential SEO-based lure or link farm tactic to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=algebraic+and+geometric+multiplicity+pdf
    • http://savuded.tcjewellery.co.uk/uploads/1/3/1/3/131398020/6c1aeaf9f7a6c0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/pomazajaseteviwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/pabupalanorokoderadav.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/bigigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/lumbar_disc_herniation_treatment_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/book_of_lies.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/programa_arquitectonico_de_un_mercado.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/libejopudevusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/rental_agreement_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/standard_kitchen_cabinet_sizes_in_mm.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75a.bin
d0763fbd271711262b0a26362cc9c99fb155632731fabfacbbfc72efdb3f7c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 2912 bytes
font_01_sfnt_off0000f1bd.bin
5a00973595673278e53f808137cf0e528383968ddc4f1c1063e9d761034728bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 5528 bytes
font_02_sfnt_off00010474.bin
44abe543bfa6f1a553c5a1fcf4b9060ae3dda662fe53ba7be25f73c95a2dec2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 18360 bytes
font_03_sfnt_off00013e53.bin
05473fdf16b367e038a5f5cabc92e306f1c6f91e9588d71d563e550f24345fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E53 17320 bytes

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