Malicious PDF — malware analysis report

Static analysis result for SHA-256 338bbb95d296c2b1…

MALICIOUS

PDF

35.7 KB Created: 2020-08-30 16:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b68a2e2b730f19c14585e01b7cddc5 SHA-1: e835bf219c0b6eb7b1d786314ac76eb805776492 SHA-256: 338bbb95d296c2b15988599e20c70097544eb7ea70218367bde4352542aeb0bc
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF documents, likely intended to distribute further malicious content or engage in SEO abuse. The document body contains garbled text and embedded URLs, reinforcing the malicious intent.

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=icom+756+pro+ii
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/semezox.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/tazojuxotuligoxobare.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/cell_cycle_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/76488883470.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/83455253933.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_74693e30b5464bbf9165a392fffc796a.pdf
    • https://static.usrfiles.com/ugd/865d50_e728db9da37845dfa4cd7c220fb4c73f.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/bucolica_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/joruvidexixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/florian_poddelka_naked.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_off00004d8f.bin
d6c598bf9520035f1fbad3bb5b7ec58aaf5699e4bc22b64ad3d4a27105f2fe8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8F 4952 bytes
font_01_sfnt_off00005e54.bin
a6eb502c9b70e247d8d931793512881ab3d8dd897d3f68364c43462489df92ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 10704 bytes

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