Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af013442a6c106c…

MALICIOUS

PDF

43.4 KB Created: 2020-09-05 19:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5060580be917353df577f5c152bba62 SHA-1: 91d67d894c90768ccda2f248f5a472090d9eebcb SHA-256: 5af013442a6c106c1594cfa770e0a2dd573181ccf92b28a4e20c8d947ed477e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL.

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.link/wix?keyword=kiss+animalize+album
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3615fb_dd025172d0464cbe8e3980cae75ac104.pdf
    • https://static.usrfiles.com/ugd/de65f7_908f8d6e8e7240a48a26152cdc81595c.pdf
    • https://static.usrfiles.com/ugd/067ecb_017168d501624898861a48ef14bb16ca.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/best_story_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3229/7124/files/pononofagumaduseli.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/tejewuro.pdf
    • https://cdn.shopify.com/s/files/1/0457/7122/7302/files/wovimog.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/information_classification_handling_and_control_policy.pdf
    • https://cdn.shopify.com/s/files/1/0449/8276/3679/files/estado_de_derecho_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/velinovaguwiwezujepebepot.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_off00006e10.bin
ad9c5f5f9a1e8cb96e4d3b4aff77c97139289736f1189e043ab21fd4fb1fda62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E10 4896 bytes
font_01_sfnt_off00007eb4.bin
e433ce3ec13236f66e7cb389129f52e62e7327621a7f1e777b6dc2db9ee51ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 10196 bytes

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