Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa1e674b8946df7…

MALICIOUS

PDF

45.6 KB Created: 2020-08-23 13:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d5b5db54f699f07f63a74039a59f98 SHA-1: b8ac56dcf8a5b58446f487bfd9c316ba2bf92b27 SHA-256: cfa1e674b8946df792135eb17eef511d35dd2e962de5651424002661c0488e51
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=editing+and+omission+worksheets+for+class+6'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify-hosted PDFs, suggesting a potential SEO manipulation or content distribution scheme. No scripts were extracted from this sample.

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=editing+and+omission+worksheets+for+class+6
    • http://files.predictiv.co.uk/uploads/1/3/1/4/131406744/sitavajupofe.pdf
    • http://files.scottcountyfasttrack.com/uploads/1/3/1/6/131636954/wadawelif_rasiwenasofube.pdf
    • http://tigegip.windermereneighborhoodseattle.org/uploads/1/3/1/6/131606490/japobinovawik.pdf
    • http://files.graziano3d.com/uploads/1/3/1/1/131164506/sepomilufurofiwu.pdf
    • http://xajalovot.serendipinart.com/uploads/1/3/1/3/131383434/a0a6982644.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/23700176008.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/breviarium_romanum_1962.pdf
    • https://cdn.shopify.com/s/files/1/0450/1949/6606/files/63754080455.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/movies_through_utorrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/66854184926.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/cambios_psicologicos_en_la_adolescencia.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/8812297850.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/xawoputumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/cardiology_free_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/niferulewil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dd0.bin
43f98177446626bd57bd163bfe708a7de2514628f95731d8dc043c0460a723b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD0 5700 bytes
font_01_sfnt_off00007128.bin
6116fb7b47edb55568732f4d66c0bf84ac3b962062fe523e717d6725a24eddd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7128 10076 bytes
font_02_sfnt_off000093df.bin
b422167e406e14456d8c777e36f465b0cf7a3429615eb346a55b07892fc128e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DF 16224 bytes

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