Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a6150b1a9f7cfe…

MALICIOUS

PDF

36.5 KB Created: 2020-08-16 12:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f843e2aa28c8e2b91eea3192b5f8e21 SHA-1: 1d113ebd650a7aa42c5a4bb35e52954942b7eeaf SHA-256: 62a6150b1a9f7cfedf249de948abd867635b34ef60aaa1c45f462bb4043b210b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body text, though partially obfuscated, includes a URL that appears to be a lure for 'escape room' related content, likely to entice clicks. 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.ru/pify?keyword=escape+room+2+level+9+answer
    • http://files.mega-marine.co/uploads/1/3/1/0/131070238/dopofoj.pdf
    • http://files.covetedgreenhat.com/uploads/1/3/2/7/132740547/1530192.pdf
    • http://gabenopel.gbwgrassseed.com/uploads/1/3/2/6/132681886/2440852.pdf
    • http://sinowab.palmcayami.com/uploads/1/3/1/4/131453133/254dfae1425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5280/9888/files/bufiwipemiluwipudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/97238754230.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/luzeloxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4206/1986/files/24801172778.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/48864691720.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/branches_of_science_and_their_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/60290622312.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/88532125558.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/coordinate_picture_graphing_easy.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7024/files/wiwubupewalunifozajajojev.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_off00005119.bin
4f6ae57c9b25b2db5a23118bc0683a4336b8100fead1e153d9f4c46ee8055fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5119 5476 bytes
font_01_sfnt_off000063b5.bin
496302eea663a06764e2b2be096a87c1c96a5564a2b0dc62f4cecc1f88dc9867
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 9860 bytes