Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f671cc67c6707…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 04:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 283c5355c1b49348e05af0b0bdce1b54 SHA-1: 0185ceab114bedfd0ef43c9084c638b4d1fbfb14 SHA-256: ff6f671cc67c67072a8fbe5e8c3ad46d8c5a0c02a900b90ccc8dcd0db02bd626
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain keywords related to '1st grade phonics worksheets pdf', suggesting a lure to disguise malicious intent. The presence of many external links, including to Shopify domains, further supports the link farm and redirector attack pattern. No scripts were extracted, limiting the analysis of direct payload execution.

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=1st+grade+phonics+worksheets+pdf
    • http://files.wrprc.org/uploads/1/3/2/6/132695467/xovazepetoku.pdf
    • http://files.authorklmyers.com/uploads/1/3/0/8/130814227/21a087de1.pdf
    • http://files.thogersenfamilyfarm.com/uploads/1/3/2/6/132695915/fopusikix.pdf
    • http://jexuxelu.branperf.com/uploads/1/3/1/0/131069839/fonititodim_jewavotetedaki_vevudu_turamukuzaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/accelerated_c_koenig_moo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8584/6933/files/99369697619.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/66082813492.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/luxoru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/sample_business_proposal_letter_for_services.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/amyloidosis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/84462702336.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/40288050006.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/68361749382.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/98662248449.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/reworojedijijusis.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c09.bin
3309700e68251a1291ad0eb184c9acd7ea861cfc449388cfbdb2732c9eca2b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C09 5496 bytes
font_01_sfnt_off00007ed5.bin
1678a4db5ff31fdcdfcd4fd19cbb56f99c7837dbff7b9c23dac5cc4ee5b44f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED5 10252 bytes

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