Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f45412972d1775…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 11:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3662be97f2cf63dce52e114409d029be SHA-1: 006831a7dde0683ee9ae4db80415654a5eb8ebbe SHA-256: 31f45412972d177509bfbf3d238acc91fd46bc9baac7c4ee17f91b920d51f371
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to external PDF files. One URL, 'https://ttraff.cc/wb?keyword=wppsi%20iii%20manual%20de%20interpretacion', is flagged as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a potential SEO manipulation or content distribution scheme. 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/wb?keyword=wppsi%20iii%20manual%20de%20interpretacion
    • http://files.yahshuauniversity.com/uploads/1/3/2/6/132681767/jusumelulopizadowim.pdf
    • http://vireko.multimodalwritingcenter.org/uploads/1/3/0/8/130814238/relile-xizibote-nojuziro.pdf
    • http://files.juliandjacobs.com/uploads/1/3/1/4/131438211/785b041400246.pdf
    • http://files.asieldesign.com/uploads/1/3/0/8/130874046/nulubeja_kebepum_xotezebatonuxap.pdf
    • http://files.classdxc.org/uploads/1/3/0/7/130775784/jisupojil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/lejekuvupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/kefupinapotamuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/93241653822.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/kabewepajepiwot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/sofixitavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0117/files/canning_process_steps.pdf
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/wonapaxarejanosi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/ronamelewelap.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/stardew_valley_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/blessed_assurance_music_score.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/lebijikotu.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_off000061a8.bin
83f9bdd91c5b12b944f17cdf44ede485ee5437340d7f6121149d0788a7d24900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 5232 bytes
font_01_sfnt_off0000735b.bin
24cb924066985fba81283ccff20a8599c1801c15e7af9ad9b12a6357bb177af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735B 10972 bytes

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