Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d63b1a8c2c30a6…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de6d5122b0d384cc298a04888b332dee SHA-1: 8484adc46c778d8d52823f73cbd772afd2ff8fe3 SHA-256: 52d63b1a8c2c30a6edb1a78f97e9a141376f1020517b3b65dfa598edd8ed9c1e
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to a 'rap beat maker app'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier 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.com/pify?keyword=rap+beat+maker+app
    • http://files.1focusbooths.com/uploads/1/3/1/4/131407152/5578572.pdf
    • http://zejak.twainquiry.co.uk/uploads/1/3/1/4/131407558/7625147.pdf
    • https://cdn.shopify.com/s/files/1/0434/0852/3416/files/ligozijot.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/zopuvevusupirusen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4061/2247/files/fetixomidunimowamatovubat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/pulmonary_hypertension_treatment_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/28355255315.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/61593158950.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/technically_you_started_it_vk.pdf
    • https://cdn.shopify.com/s/files/1/0452/3789/5325/files/80339765251.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/95888905378.pdf
    • https://cdn.shopify.com/s/files/1/0431/3514/0007/files/asus_tablet_10_inch_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/6245/0586/files/lereregowuvelodi.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/
    • https://cdn.shopify.com/s/files/1/0431/3514/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006633.bin
18e6ac4e1e05e29640a7566a1b3b35b0be756c1bc5b5dab917a1a51da4ae9386
pdf-font-stream PDF embedded font (sfnt) at offset 0x6633 4968 bytes
font_01_sfnt_off00007703.bin
1ee24447c07254924f6544b0e0c06f18c0061d1214d4acc4dd0c32ceebf6d2d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7703 10748 bytes