Malicious PDF — malware analysis report

Static analysis result for SHA-256 770fcb29d987c917…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 13:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2849172f0b7006265324e4df832b2b SHA-1: 24c5e6c42285f5623aa1973762c74ebe6b29e532 SHA-256: 770fcb29d987c9174a03874d71390a6c773ed402a2db07d30a6d5cdb05b421a6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to host further malicious content or phishing pages. The document also features a large number of embedded links to other PDFs hosted on Shopify and usrfiles.com, suggesting an attempt at SEO poisoning or a link farm to obscure the malicious redirector. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a 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=slam+dunk+typing+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4096/4759/files/s_t_full_form_bus.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/ahpra_certificate_of_registration_status_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/febrile_neutropenia_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/technical_drawing_with_engineering_graphics_giesecke.pdf
    • https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
    • https://static.usrfiles.com/ugd/b8c837_2092503836ad4d3d90a26dd88a7877b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d2897ec192445b2a6dcbf68e45d20ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://static.usrfiles.com/ugd/33c377_0f52ca01c8cd40ad887666bb32467e2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c03b92a567b24e02867ff4b7cdb0cf4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_518953b3fee04643a25df8a5cb2e4703.pdf
    • https://cdn.shopify.com/s/files/1/0438/1409/2960/files/nakolezoxogigusopebatod.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/arduino_serial_available.pdf
    • https://cdn.shopify.com/s/files/1/0437/7211/7141/files/litebutisuvudavojij.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a88.bin
3d1637c8b0b43d0bca22fcb5d6c12f0958014cc50e42be6e2e0ae340a4767894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A88 5156 bytes
font_01_sfnt_off00007c01.bin
65f4b397a3f0cf86410acb17402dddb07bccbaedbf5d0a0a3cf4476bd70ece83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C01 10804 bytes
font_02_sfnt_off0000a065.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA065 4324 bytes

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