Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b695cc12167558…

MALICIOUS

PDF

46.8 KB Created: 2020-08-14 23:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b664c925391579d4889c908aa8f1923 SHA-1: 3abe569c039220f02a910636b73e4b9a41e58ff6 SHA-256: 89b695cc1216755834b23e510229838f1cb1debcba1b33d0c49c333045963f01
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm designed to generate SEO traffic, with one critical link redirecting to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. 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/pify?keyword=restaurant+business+plan+template+sample
    • http://files.makwawamalawi.com/uploads/1/3/2/7/132740860/zuder.pdf
    • http://files.athenacraig.com/uploads/1/3/2/7/132710497/03e1b3e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/puvawezideju.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/13574170078.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/dubizademudarobi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/kazadasekugupesusubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7434/5365/files/sedentarismo_definicion_oms.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/cephalometric_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/ruvuxesowagorofodubet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/jawbone_up2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1409/3986/files/georgia_cdl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/xujanedima.pdf
    • https://cdn.shopify.com/s/files/1/0428/0867/2423/files/fubenalimuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.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_off00007a8d.bin
266b901fca21ba5445af7c00f218747b42b21b6843dfa25ccc2f88a6a546261d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8D 5112 bytes
font_01_sfnt_off00008bd3.bin
53c81fd07d7bc6eacfad643ec4d45bcf498c3ba701f5c5caaaa6f152e5e2e558
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD3 9932 bytes