Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de7f7d2121d378b…

MALICIOUS

PDF

35.5 KB Created: 2020-08-30 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243873e0c710fbc7b669046b8a5fd8a0 SHA-1: 66456a593f1e1f8be1bcd065dca5b36a3958f053 SHA-256: 7de7f7d2121d378b16190ea2b56de4b39769b43fadd8457add79eb6f18720a74
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 hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent URL, 'https://ttraff.com/wix?keyword=cummins+isx+manual+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its likely purpose is to redirect users to malicious infrastructure. The presence of embedded links and the malicious redirector strongly suggest a phishing or scam attempt.

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=cummins+isx+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3167/3504/files/adobe_lightroom_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/bangla_new_natok_2019_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0436/3884/9694/files/dewasaxod.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/free_email_providers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/37253759136.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/9366827062.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/nisageweviwijetoxonululam.pdf
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/wibakisupigobumadunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/medical_virology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/36492708678.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8605/files/37049298330.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e6b398d058943dbb13f6b901c17a748.pdf
    • https://static.usrfiles.com/ugd/b8c837_611ab0e9ed0f4056b6505d083582c493.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d62abdaa7d46f190e8ac679db85724.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_off00004d0e.bin
c658f62620c528b8e5993f92f614cbb0acbfa4d7a78461c9c0f83f3c940ece17
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0E 5064 bytes
font_01_sfnt_off00005e37.bin
969111754841f94f1c6f7085c13ea107cbe1c51959fb3c5997e66de744d8fa0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 10328 bytes