Malicious PDF — malware analysis report

Static analysis result for SHA-256 314c24b4542b86eb…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 16:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8245c95a042f9abe4deb51f7158cf3 SHA-1: 5e02651140aa7b3b00645f7a5833b270e17c3daf SHA-256: 314c24b4542b86ebcd79ff3e1122803c113d116e68a31a1971e1543a37c20e52
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Burlodge multigen 2 manual". The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=burlodge+multigen+2+manual
    • https://static.usrfiles.com/ugd/0fdb6d_3b3caf4b373d41bf8a9db8ad527db46c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb15c813e9b41e5926cdd94b6d46cd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_847af44f1b3546cfb31964275fee38e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_de645057731a4d4885797e5ec200911f.pdf
    • https://static.usrfiles.com/ugd/6f58fb_94a9871910124cd6b0d597845b3a9a79.pdf
    • https://static.usrfiles.com/ugd/b8c837_35130c0df6dd4341b1707073b8656f67.pdf
    • https://static.usrfiles.com/ugd/f65518_a31b6657752e45b4839041352ce412d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/49be48_3ffe97a791b9483cb5d3df08fb3eb4b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_136f5b22e5ed455f9f3d9a3404f5ebc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_25ac3e0f25bb42f1a1fc6501181d2e5f.pdf
    • https://static.usrfiles.com/ugd/d162e3_498b2d5b6935419286ee21ffa63c6e83.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/71111921821.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/87787783866.pdf
    • https://cdn.shopify.com/s/files/1/0435/6820/1889/files/24581572999.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/wojoguna.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_off00006c19.bin
a1a980b915225c4c65029e7cde889453e0a65cbbebab66b8341cabf453e95960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C19 5032 bytes
font_01_sfnt_off00007d15.bin
e670587ea140b9cb748f6a6b7594ca067114a8dbade6d6761f71476d1e89e419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D15 12436 bytes
font_02_sfnt_off0000a5b5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B5 4324 bytes

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