Malicious PDF — malware analysis report

Static analysis result for SHA-256 a320172917751626…

MALICIOUS

PDF

32.5 KB Created: 2020-08-31 15:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9c743249f0f40a1cdfe737ce2a089c SHA-1: 2e8895564c3ea0b925f0dcb63582c45b5a1c1765 SHA-256: a320172917751626dde6ee4705a22c61d8533c5269ded902a96c31653bd76c2c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=risk+assessment+form+template+nsw
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/8860819306.pdf
    • https://cdn.shopify.com/s/files/1/0437/6985/6158/files/zogifesinojujabutamufim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8358/files/wekozewuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/65966856663.pdf
    • https://cdn.shopify.com/s/files/1/0432/7102/8896/files/darnified_ui_f3.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/74285367570.pdf
    • https://cdn.shopify.com/s/files/1/0463/8585/6667/files/negative_prefixes_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/tutosodufudopi.pdf
    • https://static.usrfiles.com/ugd/158fb9_550bc5f541d94c71bb69cd728787b69f.pdf
    • https://static.usrfiles.com/ugd/99965f_e5cb0eb22c5740afa5ffe7c6fe902c51.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f9e07a756ce49879421599252017b1a.pdf
    • https://static.usrfiles.com/ugd/aff7ca_cc9c8364ecc3468fa584f7e81579d44c.pdf
    • https://static.usrfiles.com/ugd/b8c837_aaf9192b759d4957b97fc0fac42a4e34.pdf
    • https://static.usrfiles.com/ugd/2e79a6_9a5ed16633ba4be19cc5c0ed4e89cf9a.pdf
    • https://static.usrfiles.com/ugd/8b9728_7c834125c1434ef694512a2f07c8a417.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_off000043de.bin
e4690ad7b8dae7f2383f1260fcac07f2c4aa0254f5ad1f05bdaf6e2e778b4a7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x43DE 5208 bytes
font_01_sfnt_off00005594.bin
40a39471125ceee0e574549832093a17b97d81bc4ededb75c4dc6fc8e62071b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5594 9372 bytes