Malicious PDF — malware analysis report

Static analysis result for SHA-256 18902d0490fa7784…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 00:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd475c45d932ec1754b0b57967940681 SHA-1: 7a3acfbcfaa620c93bc3d59005ecf260f03d0785 SHA-256: 18902d0490fa7784c3ee80ba859d520240a5e268f82820016889cf432849e772
162 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains a URL that is also present in the heuristics, suggesting a lure for users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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=new+shyam+bhajan+ringtone
    • http://files.pro-ducthvac.com/uploads/1/3/1/4/131453086/7026953.pdf
    • http://files.wolfeboroinn.com/uploads/1/3/0/7/130775635/ribeza.pdf
    • http://zuwiwaf.lion-biomass.co.uk/uploads/1/3/1/6/131606577/kowonagosi.pdf
    • http://betivug.robinsonsisland-rles.com/uploads/1/3/1/4/131408899/ximetokaxufaxu-jozaku-zerikatem.pdf
    • http://files.healingwiththeta.com/uploads/1/3/1/0/131070597/zovelur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/elay_smith_porn.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/46592534999.pdf
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/saavn_cracked_apk_onhax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/80651872904.pdf
    • https://cdn.shopify.com/s/files/1/0434/8090/7938/files/givaxubix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/windows_10_disable_automatic_restart_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/52422076684.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2520/files/dabozolezubepulitevedava.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/84393220843.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_off000044a4.bin
4432b738cee8f86c4bc8e97428488753728e705713084b6c2522a1e5a40f807b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44A4 5448 bytes
font_01_sfnt_off00005729.bin
096716f121f18f0b34e56180d5f1d9e74eb582537af269d2daacea5b9e34cb9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5729 9580 bytes
font_02_sfnt_off00007827.bin
936c89847bf200a8a55373bea3d7b1c87fdc6195b5eeb5418e4b1ba832f8e018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 7948 bytes

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