Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91aeab1da752e6f…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 00:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b75c016bb4c56ac0cc7255c3eef52e SHA-1: 4d0a6b2611dcab55144d8f0d65eec025048b5e04 SHA-256: f91aeab1da752e6f7722293bc4d689380d3d2a440a09eb006b6a072d652f5768
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, specifically `https://ttraff.cc/pify?keyword=3+billy+goats+gruff+puppet+templates`. This link is presented within the document body, disguised as a link to '3 billy goats gruff puppet templates'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many hosted on `static.usrfiles.com`. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring the user to a malicious site via a deceptive 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=3+billy+goats+gruff+puppet+templates
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/neduzurepik.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6794/files/wetuxola.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/sizixobapavirekexikoge.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/pasuv.pdf
    • https://static.usrfiles.com/ugd/70c1f8_8587eb2091f9442aa8f0429c1934f098.pdf
    • https://static.usrfiles.com/ugd/77d535_fa9edfd0315f40d58972edcccda78aa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad0c5470d84547a3b459b64627caf4.pdf
    • https://static.usrfiles.com/ugd/3aee12_9aa5e9c3c51c457c95b001c74daed42f.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d8c61b388f47fc97ebbf1c00f5c01f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b8d0798de2a4789a4b0b27ac73622b5.pdf
    • https://static.usrfiles.com/ugd/ca300b_12a8c0644c7f4e2eb977fa2ed954d422.pdf
    • https://static.usrfiles.com/ugd/934fc3_2e38e01cbfb046f69a0112d96aeb7342.pdf
    • https://static.usrfiles.com/ugd/b8c837_16f109af16784a0ba3310f4d05027548.pdf
    • https://static.usrfiles.com/ugd/12dc78_33dfa117940948ecb58dd057cbb3303e.pdf
    • https://static.usrfiles.com/ugd/07e02c_a93dd767cc034ed6a107d4c62d96f114.pdf
    • https://static.usrfiles.com/ugd/f4de5e_712b790c46ac4ad2b3bffe3f57e9be18.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6e37bd912d649e3a84a25b516bfb2cc.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_off00005f6e.bin
bef6bc8644ae08bee99292bae08c495f6448923cf304de68f5e7adac57deff6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6E 5532 bytes
font_01_sfnt_off00007231.bin
e97df1906bca002e0089462989c4eeede85dd7efbcef5134b6bb2cd546bf51af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7231 10060 bytes

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