Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b514412e4278fc1…

MALICIOUS

PDF

49.9 KB Created: 2020-08-16 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9980bdcadf654f64cca041029f475d SHA-1: 25b52a112b42c2149081305f3f462737cf0d67db SHA-256: 8b514412e4278fc1550b8284f771b13789668310e11839fe5d527be419d93047
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=corona+render+c4d', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the malicious URL and the link farm structure strongly suggest a malicious intent, likely for SEO manipulation or to redirect users to further malicious content.

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=corona+render+c4d
    • http://files.caseyharvilla.com/uploads/1/3/2/7/132712214/vevuzupakaki.pdf
    • http://dulon.singaporelawngames.co/uploads/1/3/1/3/131398560/patenetemapot_bajeg.pdf
    • http://files.sydneyrosephotos.com/uploads/1/3/1/8/131856146/kisenapemino-luvenofunutib.pdf
    • http://xidamiz.musicbymillena.com/uploads/1/3/1/6/131636825/jogevupuloz.pdf
    • http://files.vegetablekids.net/uploads/1/3/1/1/131164567/mozadufowut_besel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/14304166055.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/effects_of_smoking_cigarettes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/30799152359.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/cercle_trigonomtrique.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1014/files/something_somebody_anything_anybody_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/pixerezizobanugof.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/averting_the_old_age_crisis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/56046233594.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/zorelatilokuneda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/ariella_azoulay_the_civil_contract_of_photography.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086fd.bin
8aa54df5df65c5ff8089b3b764320f8d5b837854cdebe34f1b881e7babc46fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FD 4716 bytes
font_01_sfnt_off00009710.bin
e9a292b3e6c1079fa50653dab9d2f859501cb2091e4a74df2762d84aba3888eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9710 10912 bytes

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