Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd4f3acf5077fee…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd0690213795d467f1152e14ff16ac6c SHA-1: 73bec251562428f0725d7cbab8ecda894addf3c7 SHA-256: dfd4f3acf5077feef8c3b9c3fd3f2c1e5ee0481929536be175777860bcb23e9c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=biography+auguste+comte+pdf', suggesting a lure to disguise malicious activity. The presence of a large number of external PDF links indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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.cc/pify?keyword=biography+auguste+comte+pdf
    • http://files.thurlingguitars.com/uploads/1/3/0/8/130814101/fupibizavuvoneton.pdf
    • http://files.pinkandbluelife.com/uploads/1/3/2/6/132695418/c4429dda468.pdf
    • http://files.rebeccabrillweitz.com/uploads/1/3/1/3/131397946/32346a0f71f.pdf
    • http://files.sscaz.org/uploads/1/3/0/8/130873828/vejilot-xuwat-suxufaborok.pdf
    • http://files.pinkandbluelife.com/uploads/1/3/2/6/132
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/23132048092.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/55570396568.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/jojedidetojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/67099719521.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/vonalavunuzexuvifizeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/14497297439.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/98146931085.pdf
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/lovasotamibavamodudis.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/56204127414.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/11238856280.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/33689730295.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/93613664609.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_off000070ea.bin
a01e9dc77d3a7ddecf29471952c71f9bf1b30446e97adfdbb22ac79d5f95e779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 5464 bytes
font_01_sfnt_off0000838e.bin
993f09df392125ce0f4826501d13c93f67c6785d52824a1480b5ed4d68f6e29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 9900 bytes
font_02_sfnt_off0000a55b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55B 4324 bytes

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