Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee1c2708686df3…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 06:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 278419072b853ec72b14cc9e0e01fd52 SHA-1: 5acd90243a351db14023c915681dc6f1f1f11dfc SHA-256: 1aee1c2708686df332967ad38d52b8e5d1cfbf579dc2b09fc8749d32e69194d5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a PDF link farm, indicating a lure to external content. The embedded URL points to 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The primary attack pattern involves tricking the user into clicking the malicious 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.cc/pify?keyword=fetal+circulation+flow+chart+pdf
    • http://files.stewartvilletigerstrapteam.com/uploads/1/3/0/8/130813373/6e8f489b0ce84a.pdf
    • http://files.theroombrighouse.co.uk/uploads/1/3/1/6/131606011/8712115.pdf
    • https://cdn.shopify.com/s/files/1/0450/7149/9416/files/gakolivixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/83147055172.pdf
    • https://cdn.shopify.com/s/files/1/0430/6196/9057/files/wowuratebakinomamoduno.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/51456637241.pdf
    • https://cdn.shopify.com/s/files/1/0433/8535/6449/files/70716040728.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/7259762521.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/63854412358.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/5220232614.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/84815596833.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/35291434669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.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_off00006b3c.bin
42bc7bdaafe07a1f8235cb3ce5f51acbd6099779cf88fb302ef29a24622d80df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3C 4996 bytes
font_01_sfnt_off00007c3e.bin
4da42396c9349cc5e7026f6c2b6fde25c94717cc60079eb3c183e22d3090c1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 10232 bytes
font_02_sfnt_off00009eaf.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAF 4324 bytes