Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9bc855e02db958…

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 19:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d75e7abb25c89c5fd2625faba8e67f97 SHA-1: 3ac5da5621948c28b8139b8012b2798b7bf675e5 SHA-256: 9b9bc855e02db95819a2abb511a3aff1b3f7b0dab60d55dee017611c5c019250
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'araba oyunlar1 android oyun club'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt 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.ru/wix?keyword=araba+oyunlar%25C4%25B1+android+oyun+club
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/21571250169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0461/7338/8953/files/vutobanudujolulij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/newegegerabusadoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/mezolidogewepaxe.pdf
    • https://cdn.shopify.com/s/files/1/0446/0537/4628/files/66883105568.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/getepotuweluwakaguxulun.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/37117589946.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/79516230.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/76528727184.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7255/files/kuwakopasigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/71462006712.pdf
    • https://static.usrfiles.com/ugd/a18aa6_747dcb7e079446c9899d7f2fc444efe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92c904487cc4e9981450bb482de60a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a4efbfdb90b458abc7854d09df9785c.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_off000060b8.bin
b7a4ae131a77ccfc89d7bf987bf708c6cb991bc701618fc560f83762bdb85b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 4700 bytes
font_01_sfnt_off000070a4.bin
247d1ab74daebe5854e8d10f4f19040f5fb678f3596a4c4fd3439fcc026b6052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A4 11028 bytes
font_02_sfnt_off000093ed.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93ED 4324 bytes

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