Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d1deaa72f1fbf0…

MALICIOUS

PDF

33.7 KB Created: 2020-08-03 19:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a59ca75888443505ac3e3f927c1f965 SHA-1: 6bcf8d6e21d6ec44933aacf5da17d825437d8080 SHA-256: b0d1deaa72f1fbf0862da744879c8b78a9a0d03f7f8418ba0af91b427b7bc262
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs point to a redirector and a large number of other PDFs, likely for SEO manipulation to improve the ranking of the malicious link.

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.com/pify?keyword=holt+physical+science+book+pdf
    • http://xegupu.audreymmartin.com/uploads/1/3/0/7/130775169/8c15faf3.pdf
    • http://files.chriscooleypiano.com/uploads/1/3/1/3/131380521/9731322.pdf
    • http://files.doblarsarena.com/uploads/1/3/1/4/131483343/9407bc2.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/tawodop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/sibubimogegoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/jalerirabanepinuxuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/dukodafikirewitaxejigiw.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/xorikelokedut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2748/9183/files/fivavakiduvivupov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/busitivanapomuxibopawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/15473643150.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/dewaxidesodedumanivavusog.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/25759009226.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/89045096117.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_off00004585.bin
8df456ee66f44c33abf0a4b20807b97fc722bfcfc5e634d3322b211298f8e267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4585 5412 bytes
font_01_sfnt_off000057ef.bin
1b6bcdd1b61ab61d245c0f1754d62e64a9a715a50065aa9a6cb28e3a821cd0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EF 9676 bytes

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