Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b61a23d9762edd…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 10:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a671fcb09d96302c1d6c2ec5ac58bb1 SHA-1: cf7434539df91fe37e49ec449bc37a0e797da3db SHA-256: 45b61a23d9762edd3445273f85a11da692c30b28cac6c2630ed5bdf332a6ddc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a utility for adding text to PDF files. It also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The primary malicious link, 'https://ttraff.ru/pify?keyword=add+text+to+adobe+pdf+file', is designed 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.ru/pify?keyword=add+text+to+adobe+pdf+file
    • http://xeratade.oldpawsnewhearts.com/uploads/1/3/1/3/131383314/sufulad_refuzasemulivul_futejupulame_bezuwij.pdf
    • http://files.andrewjack.net/uploads/1/3/1/3/131380008/48fcb728.pdf
    • http://vivave.donjitsudodojo.com/uploads/1/3/1/4/131453197/wapixiduvanitigom.pdf
    • http://files.kinbasketlakeresort.com/uploads/1/3/2/6/132681949/1684a3a.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/19263752170.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/27202723487.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/swg_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/29309480121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/zip_code_to_lat_long.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/punedigugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/19626863795.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d89.bin
11a71e2dc0d1ced1474123e46acbc521a3d42589e4e628482c13285aed51324c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D89 4956 bytes
font_01_sfnt_off00006e7b.bin
ce4d6bb5813c8fc4a6f4e76e8380b62b58ff7b1b573698c5459ede272e6b4762
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 10308 bytes