Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f402785c0f2d143…

MALICIOUS

PDF

38.8 KB Created: 2020-08-05 09:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0346ea00b4f28704d78bae1ac8a872fa SHA-1: 8abd0bad0dbaaab02089dc11010307e1468dccb2 SHA-256: 6f402785c0f2d14363a323d5e37a5738d2db81c9a78e43318175a98dab92768f
162 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. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While the document body is heavily obfuscated, the presence of the malicious redirector URL and the link farm heuristic strongly suggest a malicious intent to direct users to potentially harmful content. No scripts were extracted from this sample.

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.com/pify?keyword=animisme+dan+dinamisme+pdf
    • http://files.paengaroanortha1-2.com/uploads/1/3/0/7/130775997/nomavuxukilota.pdf
    • http://files.msamsonovcpa.com/uploads/1/3/2/6/132681295/jibugejarus_bunuvovurasok.pdf
    • http://bawebigul.ltcampervanconversions.co.uk/uploads/1/3/1/0/131070450/c4a8c4cd.pdf
    • http://files.circlecamps.org/uploads/1/3/1/6/131606730/b0e2093e09ee96d.pdf
    • http://zojaxev.fmassari.com/uploads/1/3/2/6/132682051/vukajomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/blitzkrieg_bop_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/sokirafemisuwodanib.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/aflatoxinas_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0436/0306/7038/files/82431271995.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/tutojoweb.pdf
    • https://cdn.shopify.com/s/files/1/0436/1040/7069/files/veserorapu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/54713435899.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/91234984840.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/darnified_ui_oblivion_nmm.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/bowflex_xtl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/18872763582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93366398369.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac1.bin
887098f6c68b57c902286da4aefd49360b2bee40e6407ffeded55903417be05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC1 5048 bytes
font_01_sfnt_off00006bde.bin
87a2e33bef65a174c4b5376c840254bc43618a99653ca3e2059ecd4581f012a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDE 9980 bytes

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