Malicious PDF — malware analysis report

Static analysis result for SHA-256 410b24d98dfe07ed…

MALICIOUS

PDF

50.2 KB Created: 2020-08-22 11:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3743a817318a871f5f93bf215f4e1e38 SHA-1: 87d70082b40bd1b1d166ac6e4293e4f0f3210366 SHA-256: 410b24d98dfe07ed87637db44d14a012662c992cb82cbbaf54c3abc5d6c27521
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=beden+kitle+endeksi+hesaplama+form%25C3%25BCl%25C3%25BC`. The document body, though partially corrupted, contains text related to body mass index calculation, suggesting a lure to disguise the malicious intent. 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=beden+kitle+endeksi+hesaplama+form%25C3%25BCl%25C3%25BC
    • http://kajukedum.sugarandseeds.com/uploads/1/3/0/8/130813786/996dbe559584f47.pdf
    • http://nunet.jcardinahlprints.com/uploads/1/3/2/6/132681670/8378801.pdf
    • http://bokedaga.crestwoodbaptist.com/uploads/1/3/0/8/130814237/d6abff90.pdf
    • http://files.taylortechnology13.com/uploads/1/3/1/6/131606186/9391928.pdf
    • https://cdn.shopify.com/s/files/1/0440/5015/3622/files/animal_parasitology.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/repekigiwam.pdf
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/zikoparururepuvumovijo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5369/3593/files/52215582017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/mekozamovozidoluzoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1801/7175/files/airtel_broadband_bill_sample.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0598/files/alphabet_letters_printable.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/airport_utility_5._6_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/rirubat.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/el_axolotl.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/sinukovakufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8164/6758/files/ansi_c84_1.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_off000078cb.bin
a078c60032a77cf7ae01ad41cf0e3129d5c40b772d64acb3c0f6936635982d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 5512 bytes
font_01_sfnt_off00008b28.bin
c75f3eec3abca5a541aec7c6380af15ef11d1ff477c40c037101ddadd00d2d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 15936 bytes

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