Malicious PDF — malware analysis report

Static analysis result for SHA-256 857904b8a4548692…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 08:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15fca5d4eeffbcee1c1af8345e8e38fa SHA-1: 273af3255a2987d1ac2763495adbb642dae66fd7 SHA-256: 857904b8a4548692144067f9508dbc3f9f1c508be1de141560584944bd24af68
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'used bicycle price guide' and a URL that appears to be part of a link farm. The presence of multiple external links, including one to known malicious infrastructure, suggests an attempt to redirect users to potentially harmful content.

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=used+bicycle+price+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4b68be_4f79ce36d92e47a1ad9aececc50be224.pdf
    • https://static.usrfiles.com/ugd/1b8612_3ebafa0fbfd84e1589e6aa910bee0abc.pdf
    • https://static.usrfiles.com/ugd/b5472a_fc49fb0b406045829e4b8149f245e7d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2298079133140999817f0eb7840f75a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3107dfe9b730412ba74a3e62a761ee0c.pdf
    • https://static.usrfiles.com/ugd/912de2_fc676153733042b0b51a0fa2a54fb9af.pdf
    • https://static.usrfiles.com/ugd/4479ed_7ecc846086184fe496f5a1f5c14eda1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31454b5c9f4623b96c73110c8518bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_709d2b4d8b6d45a790c0f99b97b2bc98.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_4659ecacd40e47dea171948e09ba5410.pdf
    • https://static.usrfiles.com/ugd/32777b_11c0cc0629714e988577b90683801fb5.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9687/files/13027096732.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/77123579467.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/emerson_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6442/5622/files/kajad.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/how_to_hide_columns_in_google_sheets.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_off00006474.bin
41676a6595bb7fa80c2692f86f84aed430a796e6b5ad1023c342fd1548e1ded8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 5264 bytes
font_01_sfnt_off0000765e.bin
847e1e36e630ef0e6de363b407d01de8a9182be65df73026054dda0e17e61d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x765E 10188 bytes