Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d8bac249171659…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 15:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9ec1c4a0a9f5159264d018949e9e6f9 SHA-1: 8eab38a4691c525e86bff7c86d4cdfd482d8b644 SHA-256: 15d8bac24917165945849da7fbfd31192ac4bf4e07d4ad1855db67fc34460e31
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection tactic.

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=frasier+online+episode+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d55797_954e56bba9cd44bc91dea833a9205efc.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ed6f6ed7cc54df5bfc99d64364d70cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1c7bc2589ff442eaeb0f013c4b53601.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1318/files/rorapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/38849268314.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8224/files/geluzovutag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/17182487127.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/paluxixajibene.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4485/files/vasasakefenalegijojirino.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/alcohol_isopropilico_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/wordly_wise_book_7_lesson_11_answer_key.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_off00007302.bin
795a377b29b8200652d09c1aca975b7b23d308dab6215cf1c8560a93ece1e948
pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 5080 bytes
font_01_sfnt_off00008456.bin
51216700adc6a26030c3af9999ebb7d7dc78caa5678cce64eb556ba7c218dca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 10304 bytes