Malicious PDF — malware analysis report

Static analysis result for SHA-256 770d6bd4e49b5881…

MALICIOUS

PDF

38.1 KB Created: 2020-09-03 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002023f04632b3e12c327361e41fb422 SHA-1: 47891437237cc23a1054aeae80652b3848f0d09d SHA-256: 770d6bd4e49b58816f7b03d547c4d3f047124ef36c41bf479c839e31814b6a94
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm designed to direct users to potentially harmful content. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chameli+ka+phool
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a18aa6_4d64e29925dd48da9d999b4f221ee18c.pdf
    • https://static.usrfiles.com/ugd/79e0dc_9c40b82b31754dda9a00e51fe39702ed.pdf
    • https://static.usrfiles.com/ugd/74e905_5410d4a41c594cf98056f0a26c0323bc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/basexigekiradanizijani.pdf
    • https://cdn.shopify.com/s/files/1/0448/1590/9026/files/seven_line_prayer_to_guru_rinpoche.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2904/files/solving_equations_with_algebra_tiles_worksheets.pdf
    • https://static.usrfiles.com/ugd/c81504_6ce3cdd2389c451ba303955b96e5d701.pdf
    • https://static.usrfiles.com/ugd/c2bf0a_e69413f4d8fc4dceb4c970b4eacf0df7.pdf
    • https://static.usrfiles.com/ugd/df4650_72300f614fc34c7a948b215a99f31b28.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/faxibederiwadapopajudevol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/7862557172.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/zijevulibafalabegex.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_off00005a6a.bin
137b33d121884f5768f4ea1410ca707b69e174369ac3fba889684f95087af25a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 4752 bytes
font_01_sfnt_off00006a67.bin
717d03f13870fa549e228674a46ff4c18074be1dd12d53e1aa7da0a98ab4a0a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 9880 bytes