Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fdaa64cfc6d140…

MALICIOUS

PDF

68.5 KB Created: 2020-08-17 02:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2671df0ec9e210e04af6a5d10621cbbf SHA-1: d54b662a6e855a22eb8dcdc4bb22fea8cfa02a44 SHA-256: 72fdaa64cfc6d14070d1aaa46469862dd01a6ff4d6f8d4718922afc397cada4c
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a malicious redirector. The document body, though partially obfuscated, contains text related to a TV guide and a URL that is flagged as malicious. The presence of numerous external PDF links suggests an attempt to create a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicates 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.com/pify?keyword=brighthouse+tv+guide+ocala+fl
    • http://files.bishopheating.com/uploads/1/3/0/9/130969065/5251ec016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/jakekabamofavomefawazadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/kazegexexazexofiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/64946991070.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/45631881917.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/solo_da_caatinga.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6295/files/viva_la_vida_guitar_chord.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3946/files/42597929069.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/27206868099.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/89795815164.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/3883869631.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/mediastinum_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/rifulunitamebexamuxemanol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/74924969893.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_off0000bf81.bin
9870e133b1f98c2fc63c346e697d54b11e3def64d258ae8e12b2f2e5492362eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 5392 bytes
font_01_sfnt_off0000d1df.bin
a4c541f6835246cfead0bc2b880b4b234135cc104223e1cb1801c69653bee169
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 16316 bytes