Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f2c4ecc6a96ac8…

MALICIOUS

PDF

48.4 KB Created: 2020-08-07 06:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9b96b2129c4ee002ed0e61056b351f SHA-1: 6cc0af0865fbd6561db8a1ca76dcf63a211de27f SHA-256: 03f2c4ecc6a96ac8e56294e6ccc425807bd2912f3565a46f8e4a30395f92e90f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though obfuscated, contains text and URLs that suggest a phishing or scam attempt, masquerading as a 'scope of work sample'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking users into clicking malicious links within the document.

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/pify?keyword=scope+of+work+sample+pdf
    • http://files.myscentsandessentials.com/uploads/1/3/1/1/131164519/gimikidejiv.pdf
    • http://files.diannesk9connection.com/uploads/1/3/2/6/132695749/9dae20aeadd21.pdf
    • http://files.newbeginningswalworth.com/uploads/1/3/0/7/130776841/tunanazopab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/4923491748.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/xbox_assist_0x87dd0006.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/63434165326.pdf
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/jusinufuxadoburido.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/fighter_5e.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/sinajosiwot.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/nujesogojigezuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/48096528426.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/figitamijelitu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/color_discord_text.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/dujiluvifaw.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_off0000739c.bin
e52dea1c68a20097ae8bc8b3828090052073f0331c4f047880cb77592d69a083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 5560 bytes
font_01_sfnt_off00008687.bin
b672ed32057b611730be586441f877a1b206a236b78c91f14c1564547a1c78c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8687 2188 bytes
font_02_sfnt_off0000908e.bin
0bb136c6c7f6feebab555280b8bf80250a66aace12b8262b599c71a5e468095d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908E 10116 bytes

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