Malicious PDF — malware analysis report

Static analysis result for SHA-256 b319f8b2529eeed0…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 07:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2ffe4c45a20a8fca4f50941cb3b01c9 SHA-1: 1a2d387d932e141b74770b7e30e874dc37faa559 SHA-256: b319f8b2529eeed056dfec5769e68e1701b323f02160ae33befe91ae320dae82
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external files hosted on Shopify. One critical heuristic firing indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free downloads, aligning with the observed link farm behavior. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=autodesk+inventor+tutorial+pdf+free+download
    • http://files.ericbramlett.org/uploads/1/3/1/3/131379719/21a74592.pdf
    • http://jozin.rileysrantings.com/uploads/1/3/1/6/131606227/6723621.pdf
    • http://files.taylorgaunt.co.uk/uploads/1/3/0/7/130776111/d6f70d64a66cf47.pdf
    • http://files.pctigerfootball.com/uploads/1/3/1/6/131606598/1d55849.pdf
    • http://tofojaw.lochatuathnews.com/uploads/1/3/1/8/131856333/lawexarijezives.pdf
    • https://cdn.shopify.com/s/files/1/0448/4084/5469/files/free_download_residential_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/2926626674.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7590/files/40848991231.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/x_cargo_sport_20.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/67765795942.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/zagajufawego.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3390/files/talalawapedakadakelaluve.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/ramabepirak.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/unir_dos_en_linea.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/using_dictionary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/preliminary_general_maths_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/7086/2998/files/kobavidiz.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_off00005203.bin
630f2e01d2663c595e03e0ffae559bf8356b55a95195d764ac0c571c01421c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x5203 5120 bytes
font_01_sfnt_off00006387.bin
117d1b664d31142a83ca1adebe68bbffb65fe7571b9833349147e0eb9834fff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6387 9844 bytes
font_02_sfnt_off00008541.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8541 4324 bytes