Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc035955b79dae2…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 08:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a997c9c1368c82ca75ef87f7c4586900 SHA-1: f28674050ab1940f76fa0c34082b36764c5404a2 SHA-256: cdc035955b79dae2a94e41944d72296ab33ef8d273fb888ac6e9411b5c6871e7
150 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many pointing to Shopify domains, designed to appear as legitimate content. One of these links, https://ttraff.cc/pify?keyword=apodemus+sylvaticus+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the URLs as part of its content.

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.cc/pify?keyword=apodemus+sylvaticus+pdf
    • http://files.miamfoundation.com/uploads/1/3/1/4/131408353/lovilosufululixona.pdf
    • http://files.thesustainableregistry.org/uploads/1/3/1/6/131606874/pepafesuraxar_xuzedoxujasinit.pdf
    • http://fopel.grayskullbooking.com/uploads/1/3/1/4/131454065/857586.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/71967422385.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/47610599032.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/boginakebokufoboworem.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/nuvil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29480145432.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/bizuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/56441742163.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/85033454441.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/54078307867.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/kawuzolabulofenuvitawow.pdf
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/transit_maps_of_the_world.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_off0000786e.bin
632ce7cd4c271f25264588263753e5af677ab45e71e76533e40d318623369567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 5356 bytes
font_01_sfnt_off00008aa7.bin
6ff48560bb7d8a4e470ad298af816386577bccd79ae1255cb5463f8ff714d46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA7 10104 bytes

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