Malicious PDF — malware analysis report

Static analysis result for SHA-256 811ca4f8f58b947e…

MALICIOUS

PDF

132.9 KB Created: 2020-08-06 10:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e15247eb405dcfcba8ea329f901994c SHA-1: 202ea608711e0246ac7c387770725ca8c095dd2b SHA-256: 811ca4f8f58b947ed7a52639c1c78480da8499bd008025beb708a47d51db929f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting an attempt to disguise malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=section+4.+2+alternative+energy+resources+pdf
    • http://files.deltaofvenusskin.com/uploads/1/3/2/3/132302733/feea43c15.pdf
    • http://budine.easyflighttravel.com/uploads/1/3/0/7/130739678/3737f61b.pdf
    • http://files.leetrull.com/uploads/1/3/1/4/131438157/370ed2e904e807.pdf
    • http://files.artyxan.com/uploads/1/3/1/6/131606923/9487931.pdf
    • http://files.honzahubac.com/uploads/1/3/1/4/131407977/joripane-kozazisoruzeg-majupowuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/92110746050.pdf
    • https://cdn.shopify.com/s/files/1/0428/9953/8087/files/sizatolelavomenef.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0990/files/jeguzam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/lotifedexojuzutoladas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/35088200415.pdf
    • https://cdn.shopify.com/s/files/1/0433/2994/5758/files/93052624142.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/bakomiderotef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/jitumepanutugafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/6776577816.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/25735709953.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/verojuvokufov.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/bottle_capping_machine_manual.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_off0001cb4f.bin
c150107e9273632e2a9dd5ebfa5f41fe7eeec9b8454594f3688df73453bd37cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB4F 5840 bytes
font_01_sfnt_off0001df66.bin
b74b52047a0ecb1dbcad85dd7ce6925ac87abc8baa72282fac9261dee0e89b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF66 11104 bytes

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