Malicious PDF — malware analysis report

Static analysis result for SHA-256 83eb62fb8cf02854…

MALICIOUS

PDF

49.1 KB Created: 2020-08-03 04:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39a16d764e9c64f2369c4f7d8b186ad SHA-1: 117aa55065f4f6f0058012fa4bbb847c78e665f2 SHA-256: 83eb62fb8cf02854471b1dd319d91daf3b24978ba58b2b25042eb369778732ef
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted from this sample.

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.com/wb?keyword=auditing%20standards%20pdf%20for%20ca%20final
    • http://files.jcbnc.org/uploads/1/3/1/4/131452836/83c2755.pdf
    • http://files.arnhemfallenangels.nl/uploads/1/3/0/9/130969710/8779414.pdf
    • http://files.jonperryartist.com/uploads/1/3/2/6/132680852/lopuzosabuw_lonoxoxa_zibidoxewarikeg_womizezitejukoj.pdf
    • http://files.allisonsellshomes.com/uploads/1/3/1/4/131437147/toteviri.pdf
    • http://files.skski.net/uploads/1/3/1/8/131871799/fumijifivi-vosadeguguzubok-pudez-tikekadexipowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/dujugavabilapejuku.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6475/files/diletodifizedalugilag.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/xenupitapedinabanakega.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/76039852317.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/popupunukunuzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/ragigutavozakatar.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/53656686590.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/36694549185.pdf
    • https://cdn.shopify.com/s/files/1/0448/9058/7291/files/ford_e350_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/lavojukipiwevevabimedilok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/markdown_comment_out.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/zedususedodijivomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7494/files/alexa_won_t_connect_to_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a7b1.bin
42b024351c5badbd257f687d9fc6f042f4e10924f4f848b758ec10c5ad55822f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA7B1 3876 bytes
font_00_sfnt_off00006711.bin
1c2dfbd8d8bbdb52d89a34109e44ef06913c348dc0c2e4d317bd7928f9a574e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6711 5312 bytes
font_01_sfnt_off00007931.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 3720 bytes
font_02_sfnt_off00008494.bin
a29b3410032fa20f9ca11f7c357259db43f72c6a83235a02e9be65a9b9405a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 10248 bytes

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