Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b574d6ae5a9a98f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 19:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68abbb08c32daa9a0e367815ef77507 SHA-1: 19470b7e1e5aadb290035cfd0f9aef5c2f16b53d SHA-256: 0b574d6ae5a9a98f01a1bd3851b5ed7380f55dd6425b5a0a37773cbc9ce32779
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious redirector. 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.cc/wix?keyword=cortes+modernos+2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/78636831702.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/71315433213.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/damenajelinefogejuware.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9741/files/59916728534.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/16733809060.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f9e051fc1024cb1a83a812d439373db.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a46d5b8ab294e7a97e3382c3e3bb177.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec46b9046ca94cfe850ab314226bdc4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b95716b858614aa88eb1b35794524522.pdf
    • https://cdn.shopify.com/s/files/1/0451/0390/6969/files/72658140843.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/42770838362.pdf
    • https://cdn.shopify.com/s/files/1/0462/4436/4448/files/gumejoguxoleduzifokozijil.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_798172aa48c249a4bd6b334d98c681a1.pdf
    • https://static.usrfiles.com/ugd/19103d_afd0a9e9bbd7409dbe8190faecd58c7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5d72d8fb86b42059382dd488905e9a3.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_off00006741.bin
eeb09f1803e58c448cc242d05667129af60cda3d3c8fb38f6f380de8f83942e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 5040 bytes
font_01_sfnt_off00007858.bin
62a7d122c8860b40990528b0b3d1488c3643df0b4b12d99d0257e28ebbaa0772
pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 11144 bytes