Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2ba137f5791031…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cdf1ac4c145a6a91bd6ed9361325ede SHA-1: 7f019ab0278b1553da9a53a81e582b25fda3d7dd SHA-256: 8c2ba137f57910313cdf58589edd04f94c834cc5329de739a3183e410e1ee296
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to citing dictionary definitions and references to wkhtmltopdf, suggesting a lure. The presence of numerous external PDF links points towards an SEO spam or link farm strategy, aiming to drive traffic to potentially malicious sites.

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.link/wix?keyword=how+to+cite+dictionary+definition
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/tozojugamerabegaxekadis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/mofosek.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/brave_not_perfect_book.pdf
    • https://static.usrfiles.com/ugd/b65acf_68a5f574eeb74288a87fec0c993ad059.pdf
    • https://static.usrfiles.com/ugd/b8c837_52346687f5634033a3c8650e4c378df3.pdf
    • https://static.usrfiles.com/ugd/cac9e4_c2c6f3465a424f6391b5b1719b5ac938.pdf
    • https://static.usrfiles.com/ugd/a18aa6_12924ddb4b8c4636bac1a85653743469.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/megexudopimotuwakuduz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/pigifopovojopusibab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/california_fire_permit_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/gugovaguzipuxaxavejeni.pdf
    • https://static.usrfiles.com/ugd/353d00_f4026e45d67341158bbed6e9d3620ba3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eed99d82ee74410ab42ccda4f97eaf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_38ccea0c44e842ccbf725d4463304f12.pdf
    • https://static.usrfiles.com/ugd/09c3c7_407e91ddbab742da8b26634529f1a1ed.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_db75b7ab36424b3da9e9d793af2bbada.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_off0000637b.bin
c4be4072d56597280516990384348fe72283ae8a55d0f6f272dfeefced6b3ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 4960 bytes
font_01_sfnt_off00007473.bin
16c1f293c19de897469399198dfb8891f9ab4ac72035b49b2697b788a7e8f1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 10008 bytes

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