Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d09286e1badd4d…

MALICIOUS

PDF

56.7 KB Created: 2020-08-05 14:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e1c8f0a42b8c131422208c3d935dd7 SHA-1: da5ad7f37cb3f8f38b5b535d401e7322b4012287 SHA-256: 78d09286e1badd4dcefeae468025b478d821d6cc9ff93d72200baa314da10425
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'ttraff.cc', indicating an attempt to redirect users to harmful content. The ML classifier also strongly suggests maliciousness. The document body text is heavily obfuscated and appears to be a mix of legitimate-looking content and embedded URLs, likely intended to disguise the malicious intent.

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=joint+pdf+to+joint+cdf
    • http://files.hirotakakasuga.com/uploads/1/3/0/8/130814043/wuredanobabi-xilamare-rutivakoz-tufiro.pdf
    • http://kisixas.gesamtschule-kunow.net/uploads/1/3/0/7/130740522/6310500.pdf
    • http://files.dalevillecob.org/uploads/1/3/1/3/131398224/3595968.pdf
    • http://files.bioprimehp.ca/uploads/1/3/0/8/130874254/6914273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/git_add_permission_denied.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/xirebav.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/sejatuladuset.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/mefoxebulixefa.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/xitekugemaremunipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/xutoxadobijisebutotele.pdf
    • https://cdn.shopify.com/s/files/1/0437/3001/0273/files/birth_plan_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/nobamip.pdf
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/abirami_anthathi_tamil_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/kivowolupifisap.pdf
    • https://cdn.shopify.com/s/files/1/0437/5035/9194/files/vaviriledosuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/xerumisebebovomaxivujexi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/34951511619.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081fe.bin
0c203d9e81fd95092cdd2b6e6c91c17dd717042ce2bfa4bc84369d1b99fc89da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FE 4696 bytes
font_01_sfnt_off00009221.bin
85ecfdfbcfec321215a3895a1c831b3f982327b9bea8e47f7c55d30b044c30ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9221 14500 bytes
font_02_sfnt_off0000c008.bin
f2f4e0122114c1816daa51f7260f1c888ba214d5879cb99462a3968212a29bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 16268 bytes

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