Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cb8affb2fc4de5…

MALICIOUS

PDF

48.9 KB Created: 2020-08-19 19:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca3d02ee6e4d4654c07db4cd5aac77ec SHA-1: 07017923a3b53361d021fdd295c47447676c8956 SHA-256: d3cb8affb2fc4de5a77b113c26b2a0b0bcdfa846b98c2ce4c9f05ed1939816a4
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which in turn leads to a large number of embedded links, many of which are hosted on Shopify but some point to other suspicious domains. These links are likely part of a phishing or malware distribution scheme.

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=the+beatles+album+covers
    • http://files.salonnova.hk/uploads/1/3/1/6/131606060/rovoluropulava.pdf
    • http://files.electricotterdesigns.com/uploads/1/3/0/8/130813782/bonotijafabil.pdf
    • http://files.nekc.org/uploads/1/3/1/4/131437504/4481663.pdf
    • http://files.winninggodsway.com/uploads/1/3/2/7/132740519/f223560a2.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/pasojodezut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/97387359365.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/ruwejolozakot.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/64442255830.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/55810440808.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/36455320389.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/figugo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/84575747543.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007434.bin
978c74282b781960af8c01d47f5dcbcf18baac3963f5f40bfccc5b7958c0633a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 4916 bytes
font_01_sfnt_off000084ea.bin
c8e6e4f8ca3587d28701ef784516685d05c6ef8c526cc60debfe3d210e72c396
pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 10352 bytes
font_02_sfnt_off0000a852.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xA852 4324 bytes