Malicious PDF — malware analysis report

Static analysis result for SHA-256 642a6395b39b878f…

MALICIOUS

PDF

55.5 KB Created: 2020-08-30 01:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 448b154c1eea508dfa49e39b5d77c88e SHA-1: 209c9f6cc3aaa05d4b8fd52976bb8d358a7ad595 SHA-256: 642a6395b39b878ff9bd7161ad9fd2ce30efa3e8f184a351889b0fa0783f673a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to '5e adventurers league backgrounds' and a URL that is part of a link farm. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=5e+adventurers+league+backgrounds
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/93c935_84870a89864241f19c5d55e7bed5514f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a383a491994bdb800dbf6807dcff9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d41ebc1c0c414217ba1cb1f3862fb80d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1948a1f182a64a24bd371e375ea045b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1c8e0aa06f8420399027d1e12471151.pdf
    • https://static.usrfiles.com/ugd/6f53d7_98bad1d2168b46c3bd1b1fb5d13dee68.pdf
    • https://static.usrfiles.com/ugd/fa6f14_e019679e749940b19ecd1551db315331.pdf
    • https://static.usrfiles.com/ugd/3fc21f_3590d618c7404fa8a5c379a17bf7f3de.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd283b680f7540edaa1e482e831b5bc9.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/41195726684.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/47375107517.pdf
    • https://cdn.shopify.com/s/files/1/0466/4990/1221/files/billi_akh_song_mr_jatt_com.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_off00008e61.bin
bb8d71ebcc52e9d03280d51d5bb644794fc46bae050a95bc9cced3e77411b35c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E61 5400 bytes
font_01_sfnt_off0000a0ca.bin
afc42a71cba43e9787b3c21d80ba3d243bc21c62415d3bd2a5b399e99626e76d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CA 15740 bytes