Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2386a575855b44…

MALICIOUS

PDF

55.6 KB Created: 2020-08-18 16:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0355b974150b8a88b7bb57f5397787f7 SHA-1: 2fb64ff3ed6b1b88464a66a65f6cb6a0bfa25b9a SHA-256: 6b2386a575855b44aea5e936ef5e1149ddadbd64dd68caf9935a27688c8cc6ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm or SEO poisoning attempt designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=shyam+bhajan++mr+jatt
    • http://voxobe.risingstars-nursery.org/uploads/1/3/2/6/132695471/8825396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/3558/8770/files/lefeponufelexowipuxosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/17073906289.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/xobobidisofoxigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/sumerolojol.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/mezoguwewinovamemu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/bebose.pdf
    • https://cdn.shopify.com/s/files/1/0438/3067/3565/files/71679669858.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/9266175548.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/69983227053.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/bimibimikexago.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/magetikovuboj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/rolofomogizezil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/97463988432.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/22537037360.pdf
    • https://cdn.shopify.com/s/files/1/0431/7478/9281/files/conducting_a_performance_appraisal_interview.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_off00006730.bin
9518674fad1a9068611f6a7ca5647e11b25a12f2dbc932a637afbaa193d5fb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 5136 bytes
font_01_sfnt_off00007892.bin
fd796cc16f703deab7dd5a6b415e5ad7380f94232a6ba7e210f74d8298258181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 14688 bytes
font_02_sfnt_off0000a756.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA756 16164 bytes
font_03_sfnt_off0000bc8e.bin
2df2a4fbc8b5a41a541dd9bc7a05385b255bbc6d193bd64a804594b40ffc7c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 5708 bytes

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