Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76e3708c4c1fde6…

MALICIOUS

PDF

72.3 KB Created: 2020-08-10 20:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343f83c69bb2c861f42e9345abe851a9 SHA-1: 283e4017f1311c5e85c3fa009f23007436f3be6b SHA-256: b76e3708c4c1fde66048b606d7c9433806450cbc85f3b82890a9353316606f2d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including one to `ttraff.ru`, suggests a potential SEO poisoning or redirection attack designed to lead users to 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.ru/pify?keyword=jurnal+logam+alkali+tanah+pdf
    • http://files.factorycarts.com/uploads/1/3/1/8/131856950/zajukivapeponasolos.pdf
    • http://files.mx.cbisociety.org/uploads/1/3/0/8/130813855/3379694.pdf
    • http://gusirovuz.spwrestling.co.nz/uploads/1/3/1/3/131398360/8429202.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/luleraga.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/microelectronics_circuit_analysis_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/28259365515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/19183492194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/18785335020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3381/files/tools_used_in_monitoring_and_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/99514147282.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/98327055743.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/35496513813.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/35918714984.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/bajagobusizirajanixabavu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4cf.bin
a8ae5b49386fcbb6c62d4fee421af4c7418b9404af91c28ec2396d4dbeeafea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 5096 bytes
font_01_sfnt_off0000c5e6.bin
beef5c8fd7fa7681357d0065a5f208815f401ac8181a10aff44a762bc89f93a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 12616 bytes
font_02_sfnt_off0000eec8.bin
8fa85aada0ab7bcd17eab1d5138e5f84a4e01d9eb2b146c510b2dddd9c234de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16644 bytes
font_03_sfnt_off000105b7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 4324 bytes

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