Malicious PDF — malware analysis report

Static analysis result for SHA-256 28588a43b9dbaccf…

MALICIOUS

PDF

40.6 KB Created: 2020-08-27 14:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b2f9c6b22c5b90f85d2de315cf76651 SHA-1: b08c531318b9137a9f16b64154dc5f6902fe3f9e SHA-256: 28588a43b9dbaccf1d8b0d12b69d5c1601c7b243ef846e453ef8d0ab529dcf84
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, many of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains the text 'Nha study guide for cbcs' and the malicious redirector URL, indicating a lure to trick users into clicking the link. No scripts were extracted from this sample.

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=nha+study+guide+for+cbcs
    • http://files.steamworldentertainmentfilms.com/uploads/1/3/1/3/131398377/380eeb3888.pdf
    • http://files.stfxgrads.com/uploads/1/3/0/9/130969714/lasefasatas.pdf
    • http://files.blueskyfitness.com/uploads/1/3/1/6/131606923/zitanekapa_kosurime_derev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3241/1298/files/toxixaxaribodalafa.pdf
    • https://cdn.shopify.com/s/files/1/0443/2871/4396/files/introduccion_a_la_arquitectura_maya.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5522/files/aneurisma_aorta.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/jiwokesewoxoxefiporu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/75497377148.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/fezukarozigugimomumevesiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7806/5055/files/22968905589.pdf
    • https://cdn.shopify.com/s/files/1/0431/9287/7217/files/xazazovexafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/57094091032.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/11720033139.pdf
    • https://cdn.shopify.com/s/files/1/0432/0123/3053/files/58899894792.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/kadulotexarokeloleb.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/dawiwubajata.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_off00005e8a.bin
ef4efdb8b4d8503b9e92bef45f55df740fbc7fe19685433f2f318a26f093a1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 5464 bytes
font_01_sfnt_off0000711f.bin
1e1f0959f7f47c6b7262bb1f20827ae1bb9815906edc30827fc5fe5b04730741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 10708 bytes

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