Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b4fb046c34a0ca…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 14:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c96e5e3437f291e171467dfdd4679cf SHA-1: bd0755dc8132e34cadd1e60c15418f8c2031fbb2 SHA-256: 11b4fb046c34a0ca1d8c026b916e9e6c80014e76c8d72b27a18991adb74e341a
162 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'golf swing application' and the malicious URL, suggesting a lure to download potentially harmful software. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=golf+swing+application+android
    • http://files.skolen.online/uploads/1/3/1/0/131071277/koketasajobepen_kuwosudawome.pdf
    • http://files.jenmcd.com/uploads/1/3/1/4/131453086/lipuw-telulax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/24890811812.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/bearing_failure_analysis_skf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/8698400589.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/98742144609.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/27430723366.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/41027457243.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/rilezawixazisumesujaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1302/9540/files/pollination_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/julopekefaxab.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/1572483740.pdf
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/56295468184.pdf
    • https://cdn.shopify.com/s/files/1/0435/8415/9903/files/49609179850.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_off00006e5a.bin
d660a8ce2aeed19e055d4f85e5d2dcecf6f8fc9de1c2b09d35fccfccc8d4f060
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 5448 bytes
font_01_sfnt_off00008103.bin
e63e0716e7e89468f19318d8ae375adc7acc6832fecbe14c071c0133fa14ceb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8103 10588 bytes