Malicious PDF — malware analysis report

Static analysis result for SHA-256 3905b4b08edd9e99…

MALICIOUS

PDF

54.6 KB Created: 2020-08-11 05:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e40f06cbb6713fc84e09296d53f342d SHA-1: 38647d21b449dbc01493e5d6f47be0ae199f0cba SHA-256: 3905b4b08edd9e9939aee240168baa54a92b065954b0bddf839fb7e4c313cdde
148 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector at 'ttraff.ru'. The document body and heuristics indicate a lure impersonating a document signing service like DocuSign, with a call-to-action to 'Electronically sign pdf online'. This suggests the primary goal is to trick the user into clicking the malicious link, likely leading to a phishing page or a second-stage malware download.

Heuristics 5

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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=electronically+sign+pdf+online
    • http://files.ezrollpocketwraps.com/uploads/1/3/1/4/131407547/fuzuvefusulafi-nubofudeze.pdf
    • http://fagetijok.makingbusinessgreat.com/uploads/1/3/1/3/131378950/bizazedosodefivexur.pdf
    • http://files.heightscenter.org/uploads/1/3/1/4/131437806/3f7f6.pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/tevutinutijukigimixated.pdf
    • https://cdn.shopify.com/s/files/1/0435/3320/5655/files/nexuzanen.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/network_plus_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/1115/1768/files/koviti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/lodukorofudiluve.pdf
    • https://cdn.shopify.com/s/files/1/0434/0862/1735/files/62124380019.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xadonugaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/43233127261.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6842/files/adjectives_ed_ing_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/bobamozija.pdf
    • https://cdn.shopify.com/s/files/1/0438/2382/5053/files/abordagem_quanti_qualitativa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/kebotajevabaguwijezukup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/41183989468.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/61155472348.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_off00008df6.bin
197a1b9fba40683131c61d89b8f96b95e4fe2d34a7d49b7f3108a886043c193a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF6 5384 bytes
font_01_sfnt_off0000a055.bin
8416843ab4f14a0b951a1f02f5e6bc8b5e648359749be07df4ce06bcf181df5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA055 14424 bytes

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