Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8e0bb8d9f649d5…

MALICIOUS

PDF

45.0 KB Created: 2020-08-13 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24852e0933c48e7302c6b2fe3a89f909 SHA-1: 3698dbffbdc31527bf8cc33864e513c4f358a8d5 SHA-256: 2c8e0bb8d9f649d5218fae081b65f3a4b2464bc45db05dbbc0be2e8911b03277
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL pointing to a malicious redirector and several other URLs hosted on Shopify and other domains, forming a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=literary+devices+quiz+grade+10+pdf
    • http://files.jasonwangdesign.com/uploads/1/3/0/8/130874566/510b4.pdf
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://rivadox.personalbest-sports.com/uploads/1/3/1/4/131437595/3183012.pdf
    • http://poxijetiz.gillianlakethompson.com/uploads/1/3/1/0/131069934/petutoni.pdf
    • http://files.learnhealing.org/uploads/1/3/0/7/130740392/pawibekagoxiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/jamamewaxefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/dewalt_dw735_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/45129552464.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/98817324795.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/9771891253.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/lepidoptera_species.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/najulodifizupivabiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/pepofodeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/57172689273.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/linux_shell_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/kuwivuderixurofugilexi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/how_do_i_connect_to_mcdonalds_wifi.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_off00006267.bin
440c46c3e1436bb277ca6491dcf54a786878783a40b468dbd227b3d3dd620efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 5764 bytes
font_01_sfnt_off0000762b.bin
e53e8d9e5cdce0839c268bcc05c3afefdfc32b1f018d9c2699adead75e58f121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 16220 bytes

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