Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf0cb2715417849…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 17:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60380dc8970b118a1bcc71659e432bc1 SHA-1: e9b6f49a26d2e1d3a2a9c74b173c0126c38a10d6 SHA-256: 6cf0cb27154178494258fb567492ac2bd42e3884c4fdbc0e0e5e66084cdd8c78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a high volume of outbound links, many of which are likely part of a link farm designed to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=tight+lower+back+stretches+pdf
    • http://files.imaginebetter.shop/uploads/1/3/2/6/132696580/siluwukepa.pdf
    • http://files.tracykrulik.com/uploads/1/3/0/7/130739742/xozuxufitado_genuwa_tizolezolo.pdf
    • http://files.helpsavetroubledteens.com/uploads/1/3/1/4/131452958/giwisawu_tekamawojivi_vevozorido.pdf
    • http://files.thestarchildmanifesto.com/uploads/1/3/1/3/131380759/0efec3073188d3.pdf
    • http://files.stoneridgevetservices.com/uploads/1/3/0/8/130813146/wabigevilefovagufax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3942/2626/files/souncloud_to_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/doropogegatisiminoguri.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/dlink_dir_655_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/26903373484.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/75141850718.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/dosilizavosipi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/84677245132.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/lightest_reader_windows.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/xagaxifopekuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/12784327151.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631c.bin
11e641d589228d198d24ba7f5e13443dfe7ed1e5b575a4faf760f843cb5f7170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 5344 bytes
font_01_sfnt_off0000756d.bin
6d7700e487d0cf01453230dd14fb8fbcf04659462c71ab5a829768c07e1b5e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 10076 bytes
font_02_sfnt_off000097de.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DE 4324 bytes

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