Malicious PDF — malware analysis report

Static analysis result for SHA-256 71050bbd985989c4…

MALICIOUS

PDF

34.9 KB Created: 2020-08-30 04:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e9b89a3a9ff858b49d4df07cea80007 SHA-1: cdd414962db5325261ddb9b627ddc18a2070c11f SHA-256: 71050bbd985989c4f10a09e64024047f639b00b0eb4418370f5384776adf8fdf
154 Risk Score

Malware Insights

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

The PDF contains a link to `https://ttraff.ru/wix?keyword=kayarian+ng+pang+uri+worksheet+pdf`, which is flagged as a malicious redirector. The document also contains a farm of 14 external PDF links, many hosted on Shopify, suggesting a link-distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to direct 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.ru/wix?keyword=kayarian+ng+pang+uri+worksheet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/97874952.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/82470173502.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/moxetudirunasabekigaju.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/8322140123.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/26623243029.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/nikepudujimatofeligo.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/bodybuilding_mass_workout.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ee0e4978d2f4d1aa929704d3dc48fbb.pdf
    • https://static.usrfiles.com/ugd/be19e1_ffc33ac1d7664ec1a2a727053b4a513f.pdf
    • https://static.usrfiles.com/ugd/3eed2b_a9636eed5e19439aa864c21a707dd21c.pdf
    • https://static.usrfiles.com/ugd/d775a9_dd4cf882925b49a4a9b870a08a714a30.pdf
    • https://static.usrfiles.com/ugd/a298ce_2128570c06684892a4aaeaafe3a20c08.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8b46f902465c488a8d5a1dbf66640a6d.pdf
    • https://static.usrfiles.com/ugd/353d00_71a20986e7bd4b26817e69fee2eb0396.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_off000049cc.bin
b97f290e2768fd1aed82540314a32dfd2a2da0f258bf9bc2004f0bd3073199a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x49CC 5496 bytes
font_01_sfnt_off00005c8f.bin
9b6e7d4f4adcd1630f0d465567908480abaf8c4f088521666418f72c1990e08b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8F 9716 bytes