Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0604a16706a476…

MALICIOUS

PDF

39.3 KB Created: 2020-08-10 04:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0ffa6496678308e5364426bc12feb19 SHA-1: 95ae58295a53394779bc660f80bffd6b1e4ffbbd SHA-256: ff0604a16706a4764eaa6329768c16507015361f27d49e422b144b8ca3c98526
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=phonics+test+for+grade+2+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting an SEO link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the malicious intent.

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.com/pify?keyword=phonics+test+for+grade+2+pdf
    • http://fininexi.eraindianocean.org/uploads/1/3/0/7/130739625/a40180015fbb02.pdf
    • http://files.well-estar.com/uploads/1/3/1/6/131637034/91a0067.pdf
    • http://files.themamalounge.com/uploads/1/3/1/6/131636914/wokalelevupam.pdf
    • http://vuribuxo.thelashqueenofregina.com/uploads/1/3/2/7/132712207/2444832.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/69268395710.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/loloridad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/honda_rebel_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/network_management_administration.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/16218215039.pdf
    • https://cdn.shopify.com/s/files/1/0436/7784/3609/files/duluresisafumuruk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/jenamoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7639/files/wekowa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2214/files/gukivilebudorogugan.pdf
    • https://cdn.shopify.com/s/files/1/0450/5380/4694/files/chung_probability_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/55918234555.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/fusupezizejazamimumezov.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_off000050fc.bin
c1b6cc2346db215f1bb370fecda082b642f0c720a5a39cca9f2bcd3b41fe938f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50FC 3144 bytes
font_01_sfnt_off00005c1e.bin
8ff39773dfdfc111507650725c59d3baaff80576ec268a198657cc9bc6b16bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1E 5520 bytes
font_02_sfnt_off00006ee0.bin
f6449a7858fc21723b71ac1b3147785dc82c31dbb76410ab3ed9e2a3ca41ecc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 9660 bytes

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