Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f42dfd24ab0864a…

MALICIOUS

PDF

43.1 KB Created: 2020-07-31 07:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fa92116d31eb04bd09a834b1736ea05 SHA-1: 4470df12c8ea8ca40934fc6eab50b077aa034f31 SHA-256: 0f42dfd24ab0864a2ead3f3c9bb3a8cea45cddb99c06fa65639e5b87041631c1
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 pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, suggests a lure related to 'anatomy of heart pdf'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to external, potentially harmful websites.

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=anatomy+of+heart+pdf
    • http://files.martijoyoga.com/uploads/1/3/2/3/132303382/86466b8fc.pdf
    • http://files.lifesadaisycakepops.com/uploads/1/3/1/3/131383553/1845573.pdf
    • http://files.my-spiritual-garden.net/uploads/1/3/1/3/131379111/bezobose-nigamebul-mevefawaw-najolilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/7383057540.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/jabetoxiwuwugafox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/xejibafe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/20343534112.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/resozelofik.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/79567316188.pdf
    • https://cdn.shopify.com/s/files/1/0439/4139/6638/files/bakajisojamasawisutib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/36241053531.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/87344734834.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/rezozuketifod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4357/files/51799495791.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/44622093512.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_off00006d2a.bin
081a2b71b0d9c3f6898cd1f94efea29c3bf75f3ab5c719e5341f6edae3833b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2A 4900 bytes
font_01_sfnt_off00007da0.bin
583cf483baf2191e786c9d7e50a86f0815b86481314695ddce000a6cb5b396cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 9952 bytes