Malicious PDF — malware analysis report

Static analysis result for SHA-256 e160c4d8056bc04e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-13 17:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d2fb1306c137b5bd0afbab29e75400 SHA-1: a7e67be46f41b120d64c07550d12f76e5de3758b SHA-256: e160c4d8056bc04e0760196b70f96cdac5f2e5208201b25eb47ced9ec8390a59
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it contains a large number of embedded links pointing to external PDF files, many hosted on Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

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/wb?keyword=le%20gestaltisme%20pdf
    • http://files.butwheretostart.org/uploads/1/3/0/8/130874296/gutenapubeze_rukemexuwi_viwazod_jolorovuwisura.pdf
    • http://woxipinaj.yachtrockmiami.com/uploads/1/3/0/7/130776445/932868.pdf
    • http://files.sallyalee.com/uploads/1/3/0/9/130969545/2053791.pdf
    • http://files.moikaitrading.com/uploads/1/3/1/3/131380728/f9b2ac75d47.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/sda_church_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8257/files/90958842763.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/65022404416.pdf
    • https://cdn.shopify.com/s/files/1/0433/1995/1513/files/jeffrey_archer.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/giteritajaboniwaxerol.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/80258065186.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/wipeveb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7113/files/dasenida.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_off00007aaf.bin
3bfacbe68c335641834f7160a9bf5bd0886f6fd71683171b4b8548fa0a50986b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAF 5208 bytes
font_01_sfnt_off00008c65.bin
7ac0544aa9f6e648afce75028436b4bfdd9c554bec124423312c10883ee53700
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 13284 bytes