Malicious PDF — malware analysis report

Static analysis result for SHA-256 23120f14f720cbfc…

MALICIOUS

PDF

48.6 KB Created: 2020-08-21 11:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277305faceadabf79121069e905d56f0 SHA-1: ec5c2d2a1ad9654d157cf4ed76de7ce6e610f1dc SHA-256: 23120f14f720cbfc0a22caac3818af52989a93b2c6c471e21607ae6c44b5fa7a
130 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Dbrau re exam date sheet 2018 pdf' and includes a call-to-action button. Crucially, it embeds a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=dbrau+re+exam+date+sheet+2018+pdf'. The document also features a large number of links to other PDFs hosted on cdn.shopify.com, suggesting a link farm for SEO poisoning. The primary malicious intent appears to be redirecting users to malicious infrastructure via the embedded link.

Heuristics 4

  • 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.
  • 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=dbrau+re+exam+date+sheet+2018+pdf
    • http://files.roryswell.org/uploads/1/3/0/8/130814200/9513990.pdf
    • http://files.vocesintimaeartsong.com/uploads/1/3/2/6/132681826/cd8e15f31cea0.pdf
    • http://files.blackburnpointwoods.com/uploads/1/3/1/3/131398489/2060899.pdf
    • http://files.merrittathletics.com/uploads/1/3/1/3/131398195/gijofi_nifut_paduziba_vudinudaneb.pdf
    • http://files.monosdoa.com/uploads/1/3/1/4/131454158/tumabirumez.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/so_think_movie_dvd_maker.pdf
    • https://cdn.shopify.com/s/files/1/0439/7809/6798/files/makalah_akuntansi_keuangan_sektor_publik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0151/0045/files/63536924438.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/arinbjorn_witcher_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/att_virus_protection.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/honda_mini_trail_50.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/jufarebokenexuzojefexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/nadoxad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7581/4047/files/bivariate_and_multivariate_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9263/files/3042193606.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/pufixozepakizubajurore.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/nelezewezotikuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/god_narasimha_pictures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006359.bin
aabe690711ff1096bdcfc326bd26b984fb44e22dad65545e60b048c74a0c322f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 5976 bytes
font_01_sfnt_off00007793.bin
8d2fda0f34cd160644073f088f10eaff69c5fcc384b52df726ac1e00b4aafc68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7793 10128 bytes
font_02_sfnt_off00009a78.bin
2fa646a7d69531a270ee1867c696ea28ee805a8d455c709c9400fe65aa193518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A78 7792 bytes

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