Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36e1426a1471121…

MALICIOUS

PDF

45.0 KB Created: 2020-08-08 14:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc24ffb0656758270e1e768a323a254 SHA-1: 53da7614482437b467a356345a4f768516af31ad SHA-256: f36e1426a14711213c7838b18e05d79e2a03807249dfc79bce7a893895eb6589
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body is largely unreadable, but the presence of the URL and the heuristic firings strongly suggest a malicious intent, likely to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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=business+process+mapping+symbols+pdf
    • http://files.jerryshardwarema.com/uploads/1/3/1/4/131437091/devenux.pdf
    • http://jazarabif.ccioh.com/uploads/1/3/2/7/132712615/3466379.pdf
    • http://files.premieraestheticshouston.com/uploads/1/3/1/1/131164275/depusudewub_tuvilida_nudeb_pevepowapi.pdf
    • http://files.karunabadges.com/uploads/1/3/1/1/131164052/vuxexasifatirufejif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xozujegemuzudileruzodedus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/75839383469.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/pugerolajexoxogadep.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/challenging_behaviors_autism.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/65087496525.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/lovenafunotoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/bejiju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0083/1905/files/molizaretedorikarilire.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/19373147713.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/make_video_file_smaller.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/99394458303.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/bach_cantata_146.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_off0000643e.bin
674217551c75223f4cf5e8e52d4da0ee9ef154047791a7e8b622c595fbd77b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x643E 5568 bytes
font_01_sfnt_off0000770c.bin
12f0790d6a6b852964f5ad6c90bb227a1db50a7a266724516802d779d1c320a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 9904 bytes
font_02_sfnt_off000098d4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D4 4324 bytes

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