Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bfcc5638636c81…

MALICIOUS

PDF

72.5 KB Created: 2020-08-18 23:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38965f5c2e147cfd521c66dcf881ff0c SHA-1: 9b7cf6692938287e338050196da682108b66614c SHA-256: 73bfcc5638636c813ef38f7fc0370b2a6c36adea3e6b9d00c36f72297f9d0c72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=exiled+kingdoms+mission+guide
    • http://benajide.emmanovella.co.uk/uploads/1/3/2/7/132740900/lemonisawelimig-xipipawedonalat-newokabibadaxax-lipizuretir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/judinalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3669/files/naruto_the_last_movie_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0436/9681/6282/files/riwoxiwakijedutulaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/33771789870.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/bixeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/60390908987.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/31326838118.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/36896986539.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/28211266059.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.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_off0000d606.bin
b29bdd95324fdd0b7602a3ae038b2768c66003e2ab16f83c6735dcdba8d25f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 4928 bytes
font_01_sfnt_off0000e6bd.bin
ffdba5dc6bdeb0e86638aeb78890fd54ed29f202461a7002fb0d0b38934a310f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 15080 bytes