Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12dd972123662e4…

MALICIOUS

PDF

42.5 KB Created: 2020-07-31 15:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8e8fcb54460feed8bd2750e3435155 SHA-1: e3ce428af50bd9c158ffe6b53151d8c65b5e1ca8 SHA-256: b12dd972123662e4fe54cca781a32a41759769a61ade4a500367a22d34fd4976
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a legitimate document, which is a common social engineering tactic. The link leads to a link farm hosted on Shopify, which then redirects to further URLs, indicating a multi-stage redirection chain designed to obscure the final malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=klein+organic+chemistry+pdf
    • http://files.907synthetics.com/uploads/1/3/0/7/130775393/1929385.pdf
    • http://files.haleyscometrun.com/uploads/1/3/2/7/132740821/bumabo.pdf
    • http://files.daventrydogtrainingclub.com/uploads/1/3/0/8/130873973/6745225.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/60308641905.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9866/files/23982493911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/99931466764.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/sepekavojo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/12769782446.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/12284354519.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/4932888348.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/29197840811.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_off00006627.bin
3fac72383b81a39c1b7212ba550a6464b2ced0b2a26abbe008023fd938a81bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6627 5428 bytes
font_01_sfnt_off0000787c.bin
7ab6e4a84159fb0f5dd77d5ebcb6217cb74073fbab2b7416d156a853100968fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 10224 bytes

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