Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1311c68e0d0773…

MALICIOUS

PDF

42.6 KB Created: 2020-08-01 11:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd42c2ba9cf41a3793e1bf2782c28f38 SHA-1: 20d89ce825112614a84c191fce498e8e09379d51 SHA-256: 3e1311c68e0d07730e6be3a3205044b143226520d95175b92539383fe2122233
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a PDF redirector link to 'ttraff.ru', which is known malicious infrastructure. The document body, though partially garbled, contains text related to Git commands and the malicious URL, suggesting a lure to trick users into clicking through to potentially harmful sites.

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/pify?keyword=git+delete+commit+from+local
    • http://files.heritagefinancialnorth.com/uploads/1/3/0/7/130775747/wopew-jaluz.pdf
    • http://files.manateehavendecorativeartists.org/uploads/1/3/0/7/130776573/3650082.pdf
    • http://files.chloeweir.com/uploads/1/3/0/9/130969424/2979876.pdf
    • http://files.th1rdspac3.com/uploads/1/3/1/4/131437157/403649.pdf
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/dorobosobanigonokig.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/46967526720.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/12957704461.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/gameliwawi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5323/4841/files/94452205208.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/64761855058.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8903/files/13552510660.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/1751143841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28603075132.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7074/files/50148469679.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/9601643768.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/38918465066.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/zesuwutasi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006224.bin
0a07cf128746539832d32f25fb1e6c6e7af87d13ed40bde22cde29e3b3c27b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 5020 bytes
font_01_sfnt_off00007324.bin
041c445149d1c39cdad80ea99444623cb417d1a4a968cd42f8313035ab7f9664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7324 13232 bytes

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