Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c3cecd66eb350e…

MALICIOUS

PDF

40.1 KB Created: 2020-09-10 04:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceea71e32c2ce097a2afdde5408d66d4 SHA-1: 87a5e7d748a38f49292da575c421b11298eb7385 SHA-256: 63c3cecd66eb350eaf980bc79422bb4a9049827a81a00110d64bf108554bad69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though partially corrupted, contains text that appears to be a lure for 'modern certificate design templates free', which is likely a pretext to disguise the malicious links. The primary attack pattern involves directing users to potentially harmful external sites.

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/pify?keyword=modern+certificate+design+templates+free
    • http://files.southdublindanceacademy.com/uploads/1/3/1/6/131606719/lukowuloxu.pdf
    • http://vukibug.erinlands.com/uploads/1/3/0/7/130738764/nafenome_palobinimoka_mobopujefob.pdf
    • http://files.evansmstheatre.com/uploads/1/3/1/6/131637257/sexore.pdf
    • http://files.qristara.com/uploads/1/3/0/9/130969791/lawasukevug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0d7b570e39364345b586ef21a392c2a4.pdf
    • https://static.usrfiles.com/ugd/9d66c7_aea2f72ae8c245d9839c7107cbd780ee.pdf
    • https://static.usrfiles.com/ugd/93c935_ba3a32c0e9c74f23b0b315f6ea55bcc9.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8885/files/doxusebozuvovavaxesibu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/91922541351.pdf
    • https://static.usrfiles.com/ugd/b371d9_35c39fbcee3c4e0f8497d16a88fafc0f.pdf
    • https://static.usrfiles.com/ugd/b1b3ad_74218dbb2b804ffdad3521a7aebbed01.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea9.bin
a5eeaccf7dd12e440cedbe1eafb1d4a9fbff254495b6be800f81ea340f44bd68
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 5480 bytes
font_01_sfnt_off00007147.bin
f5d984dd6c46c111b4f85668f62d7dc1a0f88f3cc1c6d8bd8c5260273e712d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 10128 bytes