Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6346dd46989f4bb…

MALICIOUS

PDF

37.3 KB Created: 2020-08-26 21:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d64d8ac709ce643a6ea78ca05524724a SHA-1: cf40c211d0bb7dfc4dedb046d98eabf304a14cd2 SHA-256: b6346dd46989f4bb916b592ed2d3f7a802109d84e906d8a39806216a4390bda4
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious redirector at `https://ttraff.cc/pify?keyword=textbook+of+surgical+oncology`. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host and distribute links rather than present readable content. The primary attack pattern involves luring users to malicious sites through a link farm.

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=textbook+of+surgical+oncology
    • http://files.hettonart.com/uploads/1/3/0/7/130775645/4814087.pdf
    • http://files.leafsvanmij.nl/uploads/1/3/1/4/131482915/dafasusuveluzavobu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/34981171063.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/72771758493.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/35133010433.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/ac_and_dc_power_supply.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/biomes_reading_comprehension_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/80688968995.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/tujinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/bang_bang_movie_free_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0466/5887/9653/files/chakra_healing_sleep_guided_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0462/2676/8023/files/17302904591.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/dupanepufepefifosulaxegu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000544a.bin
b60253e69c7b9354b3b078f3da56505c635d67b5b8a75040068993b24cec7b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x544A 5372 bytes
font_01_sfnt_off000066b2.bin
76ef6a8c1fba01c58e34e90c4e610d2ccc653b75618be08d993806a61aa939cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B2 9992 bytes