Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8b33a3a14e28c0…

MALICIOUS

PDF

48.5 KB Created: 2020-08-29 19:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1318e699e4305e886170f86e253d7af4 SHA-1: f8c794a5df91e247211c7b37bda723098e110ed4 SHA-256: 6f8b33a3a14e28c0c3bc30e6f7f44b86f59e69dcb0eb10a1580d186e888d79bf
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'keygen' and a URL that appears to be part of a link farm, suggesting a phishing or scam attempt. 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.cc/wix?keyword=aftershot+pro+2+keygen
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/novomavigilafavopowamurut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1463/5165/files/23513862222.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/mokonuzo.pdf
    • https://cdn.shopify.com/s/files/1/0462/7952/4501/files/codashop_hack_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/toripinuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/sdgs_logo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/alexandre_o_grande_filme_completo_dublado.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/50268623708.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6107fba7ee425ba769464669ef6d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.pdf
    • https://static.usrfiles.com/ugd/b8c837_755704f540af4d7bb0e46674b279632e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd9bfd38d42e48b6bb8d100e0355912b.pdf
    • https://static.usrfiles.com/ugd/b8c837_acfffb4ccc3644329500c1ea517f5368.pdf
    • https://static.usrfiles.com/ugd/b8c837_0786dc5e78144d46ad16ac95f97cbaf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a687a3d8d2b548d5bc56bcab226a1abf.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_off00007eb3.bin
e862cc45c4cdd2395fd2f580c018a475db1d98f9f21ad306172517a754d80113
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB3 5208 bytes
font_01_sfnt_off0000907f.bin
ec4d9ce73fb2d067a4f3bd83c680f2f975b8a692521d3edc3ed6cdac068cea68
pdf-font-stream PDF embedded font (sfnt) at offset 0x907F 10852 bytes