Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d56d100435589d…

MALICIOUS

PDF

47.6 KB Created: 2020-08-17 13:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccaa070961c47bec1f1d6c2fb7d93cb6 SHA-1: 67797e23e8b435199e78f03a4fdd320048332fda SHA-256: b7d56d100435589d985d9675d5ea63c59a263fdea26eb1dc0010a7081bf6d0dd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting a potential SEO manipulation or redirection tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL and a large number of external links points to a delivery mechanism designed to lead users to harmful content.

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=bahubali+songs+tamil++2
    • http://files.monalisamugshots.net/uploads/1/3/0/9/130969897/womukotupopeb.pdf
    • http://files.jiahjuice.com/uploads/1/3/0/8/130873876/zejajake.pdf
    • http://tivuman.spectrumdyslexiavision.co.uk/uploads/1/3/0/8/130813117/lowew_koxana_sigimofamusuk.pdf
    • http://files.irishwildlife.ie/uploads/1/3/0/7/130775712/8208326.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/65349672120.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/63763242088.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/lefixiravawimozuninijiveg.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/kepaseruli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/around_the_world_in_80_days.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/business_plan_for_road_construction.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/process_flow_documentation_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/mokusegopimexegolexuke.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073fc.bin
0d6b404eb37eee6543984de809d37433ab6ac7d351862c30be09f4350aaf064c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 5324 bytes
font_01_sfnt_off000085e6.bin
c823dc22a2322b409702cc5918966549f260eba0649dd90fb99cb48f68f901c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E6 13956 bytes