Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b65dc6bfd631ebf…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 09:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31e53a28945dfcdd8b0e1f423c45aa7 SHA-1: b38991f267cfa1fea1c7fb4b27bfac8cd1834643 SHA-256: 5b65dc6bfd631ebf008a51b23e3ea6001ec5125f6d9ff28565ae19df5fe6e80b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is an owner's manual, likely a lure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious 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.com/wix?keyword=yamaha+f115+owners+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/jatodafubofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/gatejimoxemamosidironos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5149/files/pazarorufutode.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/lazimulilexaro.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/53850558463.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/koxalimuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/moraxaxedelilujufasub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/hunger_games_anticipation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/overview_of_computer_architecture_and_organization.pdf
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/sekinafan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/animal_behavior_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/undertale_soundtrack_piano_sheet_music.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_off00005137.bin
da65b09d734f86f851bc70d65be30ad3f111968f8b8d079b2d0ad246acd69f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5137 5236 bytes
font_01_sfnt_off000062fd.bin
9f865dc58fce99da7de36bddfade1ae2b422f702f72293d0f12c6261f08fd42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 9824 bytes