Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9e46baf839fdf…

MALICIOUS

PDF

54.8 KB Created: 2020-08-11 20:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3898c2f596bd3840fc4a62006240edac SHA-1: cab313db2afc4021da252c30c595753cbe804efa SHA-256: 9da9e46baf839fdf70c51070eeb514c5ea56d33290ffd1545a2a4d2aacd0aa1b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=celebrity+definition+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and references to 'celebrity definition pdf', suggesting a lure. The ML classifier 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.ru/pify?keyword=celebrity+definition+pdf
    • http://files.mathbag.com/uploads/1/3/1/6/131607131/3b3309d91e61.pdf
    • http://files.writingonreels.uk/uploads/1/3/0/9/130969966/2bb58a8b60.pdf
    • http://lopanalet.engagementlearningpress.com/uploads/1/3/1/6/131637016/300494.pdf
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/5466997989.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/manticore_mo_creatures.pdf
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/6716759269.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/magasuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/mifukovuxati.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/7075964148.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/ielts_recent_actual_reading_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/75052049670.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/kanowekixiwojivomibadika.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/sotolajuxajise.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/gagaridaxizokiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/camp_x_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/ada_diabetes_treatment_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/39524290195.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/english_debate_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db7.bin
bb9720850e1ef5885f266475bd8d948e229e065040f7dc92f92ae751e9b667bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB7 4700 bytes
font_01_sfnt_off00009dbc.bin
a32983c5726716516684cfc3711e3c5dde99f67e1ac4a0b84cb3deff9e07e78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBC 10060 bytes
font_02_sfnt_off0000c041.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 4324 bytes

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