Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bbfe22b73626c5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 18:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9afe4fcf2d0330e4445a9c06d7def1f SHA-1: 4b84c3434270444025e4af70401eabc7bb9f7b0c SHA-256: 09bbfe22b73626c5c8b71921482088fefa05e35155c11557645b9b5646c9ea73
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. The ML classifier strongly indicated maliciousness.

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.com/wb?keyword=creating%20formulas%20in%20excel%20pdf
    • http://fixinuto.noahguystaffing.com/uploads/1/3/1/8/131871395/d15b8.pdf
    • http://files.mccullochsfitness.com/uploads/1/3/0/7/130775286/letijufuxir-rovevuruz.pdf
    • http://files.daseindesigns.com/uploads/1/3/2/6/132681947/82ffa62.pdf
    • http://files.jcbnc.org/uploads/1/3/1/4/131452836/83c2755.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/larolodafotikewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/57203028426.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/8_characteristics_of_living_things.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/addressing_modes_of_8085.pdf
    • https://cdn.shopify.com/s/files/1/0437/2427/5863/files/butterball_turkey_fryer_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/89498836319.pdf
    • https://cdn.shopify.com/s/files/1/0429/4685/5078/files/geditarokufowuxuwaxodubod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/23918070445.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/blindagem_patrimonial.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_off0000638a.bin
75120b39e1363c3d71c089b95478df3877066b5c23afcfa1f57a6fe9301c3272
pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 5448 bytes
font_01_sfnt_off00007602.bin
63950145b081e74f40b24ed27d6bfc0cf91cae10656d65ebfc259cda6e737f12
pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 13068 bytes