Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f46ad1b837f584…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 659f9d0c72dabb1c75d0b373c28e4f91 SHA-1: 7c1949539c97256510e38db016717d473d19ce2a SHA-256: 90f46ad1b837f5843d33d9580569fdb31552d5954aebcdbb39052548c62b0ec8
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.com/pify. The document body, though heavily obfuscated, contains text related to 'best high school biology textbook pdf' and the redirector URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links further supports the 'link farm' heuristic.

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=best+high+school+biology+textbook+pdf
    • http://files.rachaeleggebeen.com/uploads/1/3/1/4/131407144/duxotamufufi-pigedekaxaga-sakigibiruw.pdf
    • http://xazala.justinmikos.com/uploads/1/3/1/4/131452922/demedevexeke.pdf
    • http://nikafujo.naturallynorny.com/uploads/1/3/0/7/130776791/b93540b10.pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdf
    • http://files.tomokeefe.org/uploads/1/3/1/4/131437669/d050e5f.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/54033803703.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/wikowedidorage.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/dipudotabenitib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/english_word_search_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/33736147193.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/chris_rock_kill_the_messenger.pdf
    • https://cdn.shopify.com/s/files/1/0439/2891/2040/files/74206192843.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/16984224269.pdf
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/sadeperojatoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/agenda_de_boda_2020.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_off00006231.bin
0bffcacf2624433062f26763487611976fc43cadb943c7c534ca6b47aa2b0d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5536 bytes
font_01_sfnt_off00007521.bin
09977a927feb5c132f6b42a9cd0955ee2a44a910b624764b1a06f32fb2817e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 10768 bytes

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