Malicious PDF — malware analysis report

Static analysis result for SHA-256 5959c9a9ba341959…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 04:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229ffd9eb1273d621b215b4cd3444255 SHA-1: e5ebbe489bf864bbf182b36af897af3710f9e7f6 SHA-256: 5959c9a9ba341959a795151d465b94fcd2bc335470dee3066177820038caa35a
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL https://ttraff.cc/wix?keyword=ajustes+y+tolerancias+iso, which is a known malicious redirector. The document body contains numerous links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic to distribute 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.cc/wix?keyword=ajustes+y+tolerancias+iso
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/zetowudonugibunojuber.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/75888237678.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7162/files/discord_clear_dm_history.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/89254106178.pdf
    • https://cdn.shopify.com/s/files/1/0428/4085/0598/files/dujodujanevemawasunoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/36736284926.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/gezinutipesup.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/1601477793.pdf
    • https://cdn.shopify.com/s/files/1/0437/7509/9029/files/54321418144.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/herido_pero_aun_caminando_libro.pdf
    • https://cdn.shopify.com/s/files/1/0451/0410/3576/files/80344788620.pdf
    • https://static.usrfiles.com/ugd/b8c837_8851dfdb54e04661ba2ea098443a24b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c6ca8ab3c047ce8bc65f36f4d9e784.pdf
    • https://static.usrfiles.com/ugd/b8c837_823f16bd4e6a43ed96410974cb865342.pdf
    • https://static.usrfiles.com/ugd/48d9a1_04e805e527ed4dfcb08cd36cb78e29d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c29ae1bceaaa479c8e4ea670a18e14fb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006562.bin
8d03a56bd7597c3cf802d310383a12728ae5979e3bea2d9e8a65d402d5447885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6562 4844 bytes
font_01_sfnt_off000075e4.bin
16faebfc2b35cad5ac35f5fc1a184a47d2e902bfd7f61ec60f20336222948830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E4 11704 bytes
font_02_sfnt_off00009bf9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF9 4324 bytes

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