Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35f09421960aa52…

MALICIOUS

PDF

64.3 KB Created: 2020-08-03 20:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4cb1f8e41eb9359983d242e3036d4f SHA-1: 0f8c115a1f86f7b710bc156f81c48baebc5647aa SHA-256: a35f09421960aa523963fecef04ff8d443553a2f9fa20b8b15d6176b29a4a3cb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL. The primary attack pattern involves luring users to malicious infrastructure via a deceptive link.

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=activation+functions+in+neural+networks+pdf
    • http://files.portanglers.com/uploads/1/3/1/8/131871614/2432346.pdf
    • http://files.quebecmusiccompetition.com/uploads/1/3/0/8/130874284/fusuze_jewojare.pdf
    • http://files.jeffkirchoff.com/uploads/1/3/1/4/131437503/fiwalesipir-jagofomedud-votoziwamoxozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/rulogepesek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/falujidabafagobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/punuwenofezovojefarenom.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/42600637950.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/pupotijaniwunevilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/42943630703.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/42895251564.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2454/files/solidworks_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/7383057540.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/dosalidarosipokuvadute.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/76495322373.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_off0000958e.bin
22edc1347776e387062b2b181e0c7684d81cf0cc73aea30292f1afb062abfc68
pdf-font-stream PDF embedded font (sfnt) at offset 0x958E 5352 bytes
font_01_sfnt_off0000a7f3.bin
ebf586e9999ad3bd956cf58911c67fd506520f74a3946ae1ca358f8c41167e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F3 17312 bytes
font_02_sfnt_off0000dec4.bin
fca8d64f2032ff1dc8571b961b776028e006988ed32c6eb63057b391456669af
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16100 bytes