Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd41da0dceb84ad5…

MALICIOUS

PDF

49.0 KB Created: 2020-10-17 12:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1912487b932105f8d7611b6ad5441b0d SHA-1: f9e22407df1b15dbf28b7eae10ae3570806406ec SHA-256: fd41da0dceb84ad553d187dfcef92028e82ec8aaeee8354ff313085e8061b8d8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/123?keyword=xiaomi+roborock+s5+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f87588ed76d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f8a4f33705d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f899ab33bc9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f888969ec4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f8a4b3cd4fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87cd2bc8193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f8748e939a25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9127/1073/files/lidomit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7147/4330/files/ot_2020_scotus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/polk_audio_rti_a9_floorstanding_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d0344e-22f4-4f6b-b5f1-9b0310c763e5/buradozesafuwufubugufojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6ab075-1db0-4bce-a16d-8e21c32765c2/96149601569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7962/1536/files/mercedes_benz_glc_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8761/3096/files/medibavoseloke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7568/5531/files/fomofivomiporikojom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9337/7183/files/husqvarna_self_propelled_lawn_mower_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7043/7016/files/carrot_top_wife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2361/9990/files/diladided.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9532/9442/files/14928659270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/capital_market_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/96404341302.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 5248 bytes
SHA-256: 1ce868802315c71a556d6d79af5a516005c9a4c39dd2e8c2fa8a2d40012c9b3e
font_01_sfnt_off000093c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93C6 10244 bytes
SHA-256: 9cdb2a4779001ab0e312e9f1a1f00110aa491750fed5d8748eb8b85c24b125d4

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