Malicious PDF — malware analysis report

Static analysis result for SHA-256 b251ee8999d2f68e…

MALICIOUS

PDF

44.7 KB Created: 2020-08-14 15:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfd06874979b90b871580e74d02d413e SHA-1: bfe7dbb7858925118272b761a11c2d3f2eef0845 SHA-256: b251ee8999d2f68e5893670e02adb767f5d56d0f50f558ea19c4ff4a702d80ec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=actress+savitri+biography+pdf'. Another heuristic indicates a PDF link farm, suggesting a tactic to distribute malicious content or SEO spam. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed for malicious redirection.

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=actress+savitri+biography+pdf
    • http://goxasuni.ablazeworship.org/uploads/1/3/1/3/131398140/daaa7e58f2d.pdf
    • http://diwafep.jennscookiecreations.com/uploads/1/3/0/9/130969945/2111587.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/nimozunuxom.pdf
    • https://cdn.shopify.com/s/files/1/0435/6230/3637/files/vagenuzozizaxidujoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/emon_and_frankee.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/zivadewuvimowisitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/tukogewawiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/calistenia_treino_iniciante.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8454/files/41974479538.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/ae_form_550_175b.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/dofofonowuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/how_to_contribute_to_a_github_project.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/expert_ielts_band_7._5.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/widupidaxapidonimi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/dipilimina.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_off00006254.bin
ba6fcd6455c458c3041424744058a82599c858c64acb7f8ac98ab6e772dbb0b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 5356 bytes
font_01_sfnt_off000074a5.bin
58fb49cf80f01055029d448a105a29e86ce10722392ac99bfde527e5a167747d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 10436 bytes
font_02_sfnt_off00009797.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9797 4324 bytes

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