Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b10566b08169aa…

MALICIOUS

PDF

41.2 KB Created: 2020-08-20 02:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01aa205788560a0141af692323608b22 SHA-1: c74f69730900084c6b9e8daf024d68608f3bfb6d SHA-256: 55b10566b08169aa432675f36e248ac80976cc09d12613c2a16e53b30ab56d67
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text referencing 'Collins connect book 2. 3 answers' and multiple Shopify URLs, suggesting a lure to disguise the malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many pointing to Shopify, likely to improve search engine ranking for the lure content and hide the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=collins+connect+book+2.+3+answers
    • http://tolefaf.soulcleanser.co.nz/uploads/1/3/2/6/132681482/5234406.pdf
    • http://files.darnhallparish.co.uk/uploads/1/3/2/6/132683264/simalaganopoguweje.pdf
    • http://files.pohchocolate.com/uploads/1/3/1/4/131407148/jodago.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/naforolap.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/64449861362.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/98994308000.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/3632307695.pdf
    • https://cdn.shopify.com/s/files/1/0444/3452/2279/files/poxekariguparokozo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/semi_cryogenic_engine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/95198295599.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/65922761871.pdf
    • https://cdn.shopify.com/s/files/1/0447/5705/7687/files/chiari_1_malformation_syringomyelia.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/nezun.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/53913508913.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1682/files/annotate_notability.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_off00006403.bin
f72fba4ad9ead270a9e2d70e54a063bfd99bfb3bcce39e7fcf30160c5ebe59e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 5324 bytes
font_01_sfnt_off00007639.bin
1605d2919e8ad179e8b9d5ce4bd47609f9bcaa9cc10ec130d86661e60a951414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 9932 bytes

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