Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16c482dcec7abe…

MALICIOUS

PDF

58.9 KB Created: 2020-08-06 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9522fbc198c3caab74afc9fe353030dc SHA-1: c9e7646d396816f8368f93a2b9e583b3acb86857 SHA-256: 6c16c482dcec7abe5b77b6362dd366e079769bed831204b1025230c1deba4852
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure under the guise of providing a 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.ru/pify?keyword=seismic+interpretation+basics+pdf
    • http://kexav.stocktonkiwanis.com/uploads/1/3/1/3/131384429/5993658.pdf
    • http://files.mhrspl.com/uploads/1/3/1/4/131407424/revegatotarigakupaz.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/jedolifuneromefan.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/71208128661.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/jutizenisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6421/files/allis_chalmers_wd45_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/gitekiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/46972283885.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/36562496723.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/nitibumonexalado.pdf
    • https://cdn.shopify.com/s/files/1/0433/6143/5813/files/saziz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/dadat.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/73644620691.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/67875436134.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/85862100985.pdf
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/61319422617.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_off0000a8d7.bin
fec84d656584ce7d260128c61460235dcd69f9bdb7c166fb823bf6b72511bcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D7 5512 bytes
font_01_sfnt_off0000bb77.bin
937c75ef209a3f885f57bbafdb6261771e1939c7e2e8465c3c56c92d9eefab73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 10192 bytes

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