Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d367a7da004bb5…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 07:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215a63d5d276fcf0c065e3e7611757c1 SHA-1: 557b4bc31164c705761c2d29fed451029ed9d5f4 SHA-256: e2d367a7da004bb527de440d88c3e90ffdf5297818fe69f5d204cd95d9b2c9ac
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs pointing to other PDF files. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=biblia+catolica+pdf+mexico), suggesting a potential distribution or redirection mechanism for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of the malicious redirector and the link farm structure strongly indicate a malicious intent, likely for SEO manipulation or malware distribution.

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=biblia+catolica+pdf+mexico
    • http://files.feelgoodafterfifty.com/uploads/1/3/1/4/131453924/domibilolugur-ripip-jawere-zijimatevuzolu.pdf
    • http://files.peoplematteralways.com/uploads/1/3/1/4/131453350/eeb32b911306c07.pdf
    • http://wixexe.trupbsc.ca/uploads/1/3/1/0/131069869/4468639.pdf
    • http://gukalajub.smhsband.net/uploads/1/3/0/8/130874422/6b46e05.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/balawugagukonuwatirizumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/lufeminomejinimi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/blockchain_beyond_bitcoin.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/chilling_adventures_of_sabrina_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/57352016122.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/logofipil.pdf
    • https://cdn.shopify.com/s/files/1/0462/6910/4279/files/6_piece_puzzle_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0439/0617/1048/files/calculus_larson_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2519/3368/files/punibiladularufirulaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/mount_hood_meadows_weather.pdf
    • https://cdn.shopify.com/s/files/1/0435/2697/9739/files/66156428226.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/brijesh_kumar_histology_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/66293092522.pdf
    • https://cdn.shopify.com/s/files/1/0438/6252/4069/files/stroke_management_guidelines_2019.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_off00005fee.bin
359439fd54e2c1720c100419da567bc00a844609b5065e6a1f3beed076dbfe39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 4968 bytes
font_01_sfnt_off000070d3.bin
7e150fcc46e60f4b2090dc4fc2b7252500ff3e495498efd5c01ad3e2204504d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D3 10092 bytes
font_02_sfnt_off00009353.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9353 4324 bytes

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