Malicious PDF — malware analysis report

Static analysis result for SHA-256 59669f49600a7eb6…

MALICIOUS

PDF

44.2 KB Created: 2020-08-13 23:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2caafc45a4f10d14656fbacad90cce7d SHA-1: 6689e79d423e3870ceeff2c3f6c3649e8190b4e5 SHA-256: 59669f49600a7eb632482e812f9ea747eb789c7bc2a68dda8f859c614d10a43b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a URL designed to lure users with an 'iTunes manual backup' keyword. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, many hosted on Shopify, suggesting a link farm or redirection strategy. 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/wb?keyword=itunes%20manual%20backup%20what%20is%20backed%20up
    • http://files.budsdoobieclips.com/uploads/1/3/1/4/131454304/b7057e1160d8.pdf
    • http://gabilinol.shopprettyplaces.com/uploads/1/3/2/6/132682076/kekinewosi.pdf
    • http://files.northwestindianaoutdoors.org/uploads/1/3/1/4/131437074/6626673.pdf
    • http://bexumeni.sheltontile.net/uploads/1/3/1/6/131637881/tokewalomuvagij.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/safazojuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1972/1115/files/43116174851.pdf
    • https://cdn.shopify.com/s/files/1/0436/4677/9552/files/38809802552.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/84535734182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/96699267166.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6848/files/85622640682.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/bugupenuxepuxujufedos.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/kerala_government_malayalam_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/chemistry_equation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/zikebokebu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/fundamentals_of_oil_and_gas_accounting.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_off00005e40.bin
025f82f8d5bec63694b74632ca130a5ce7f1cc3d776fb899f8198f4b3beeeb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 6168 bytes
font_01_sfnt_off00006de4.bin
8c66cbfedf60c9fc63145df88de9d88de25d154a64cdb88a3ecb9283c4846fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE4 5448 bytes
font_02_sfnt_off0000803d.bin
6838a09f27e58a4bcf8b9ee5b215b6c1ba82f27442148e0f053c00c4b77628fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803D 10288 bytes

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