Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d4fa0344c6d459…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 18:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 358358bfa4bc857dfdb5be4671d76ec3 SHA-1: 613c6266da7f3f561724aa427f29e4bd1e0c0712 SHA-256: 82d4fa0344c6d45976a21f3d260e14c3a90dee78958a6e1e8468104e6b0e6e15
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on Shopify. One link, https://ttraff.club/wix?keyword=weight+loss+transformation+exercise+bike, is flagged as a malicious redirector. This suggests the document is part of an SEO farm or link farm attack, aiming to redirect users to malicious sites or manipulate search engine rankings. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=weight+loss+transformation+exercise+bike
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/comensalismo_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/kovupofozasekutizuwediten.pdf
    • https://cdn.shopify.com/s/files/1/0462/3561/5392/files/88838163076.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/monetijunasolaworunexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/82783143438.pdf
    • https://static.usrfiles.com/ugd/b8c837_2de4f61e230b4eeb8bfdccea37108081.pdf
    • https://static.usrfiles.com/ugd/769f78_801159eb3f2d4aa9807f8ea8f08764af.pdf
    • https://static.usrfiles.com/ugd/b8c837_1379859d0ae04611b2704b36c748368c.pdf
    • https://static.usrfiles.com/ugd/c75f60_ce7eba8d1a524bc6a9deabd262fbf730.pdf
    • https://static.usrfiles.com/ugd/01e791_57d9a87443154f769b045514c4cc06b8.pdf
    • https://cdn.shopify.com/s/files/1/0440/5886/9910/files/chemical_engineering_technical_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5789/files/97694582079.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/wofobevigatara.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/jegefab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/tegofi.pdf
    • https://cdn.shopify.com/s/files/1/0465/1492/9822/files/pexalejizorululodipav.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/74196760271.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/29798555222.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/ethernet_controller_driver_windows_7.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_off000076fb.bin
95dc8d79c0092c83591d00b65996f3cbf1c68ab4ae5f53fd0f15abe08eae3bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FB 5580 bytes
font_01_sfnt_off000089e7.bin
a69c4c5340a7a8a7fd9a6312a586985dfcbd80b06da5f0b1d1505fce005a2379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E7 10352 bytes

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