Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da9eaacd8768e02…

MALICIOUS

PDF

41.4 KB Created: 2020-08-25 14:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b507e829b38ce1f84476310965a729 SHA-1: 4d98270d3dab7d12c694a9bb7af65c57c1d1e665 SHA-256: 8da9eaacd8768e0215fdb60dedb3c64ca0d571c4740857fee1e1cdcd08b752c8
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=mathworksheetsland+permutations+and+combinations+answer+key, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to lure the user to this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=mathworksheetsland+permutations+and+combinations+answer+key
    • http://files.davisfamilyatdeanpark.com/uploads/1/3/1/3/131383665/xegemifarotaworipo.pdf
    • http://pisuzag.hilltophives.com/uploads/1/3/1/6/131636725/sikuvuzaxi_mafonulud_banuza.pdf
    • http://files.yorkhabitat.org/uploads/1/3/0/9/130969368/57c8bcf70d5940.pdf
    • http://files.fctnbombers.com/uploads/1/3/1/3/131398236/9886748.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/94462991473.pdf
    • https://cdn.shopify.com/s/files/1/0430/3178/9721/files/preparation_of_phthalic_alkyd_resin.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/65644277587.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/absceso_dentoalveolar_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/7528577899.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5832/files/39354303086.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/79369283881.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/athlean_x_shred_program.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/22745616661.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/tibanetan.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/pazemanusubavok.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/26961492472.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_off00006191.bin
84550d1fd0e999a4456c784efd5e96f53ec12d312fbfbfd66c019501dbf9c3e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 5716 bytes
font_01_sfnt_off000074f4.bin
2599ebd7c95a5b8a5aae80a01a16d6007aeafa8cceb9c74f37fe2650e822ca7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 10372 bytes

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