Malicious PDF — malware analysis report

Static analysis result for SHA-256 505ac2f8555bf69d…

MALICIOUS

PDF

55.3 KB Created: 2020-10-26 09:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7cda5897f417a0849ec62ea0074e4d8 SHA-1: 7b4522ecf91ec7ba5a82f68e9f3b16bd4155b264 SHA-256: 505ac2f8555bf69d27789765e58d2eebcda580992031fe1aa47582503311334f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for downloading an APK. The document body also contains this URL and numerous other links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.club/123?keyword=privacy+lock+old+version+apk+download
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87711f99002.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8a2308ea87f.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f92ebdaaeb14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/felasorarabipis/71064594209.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/bluebeam_revu_2018_tutorial.pdf
    • https://s3.amazonaws.com/fusidejebi/xaxizene.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/numark_mixtrack_pro_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0488/1448/9765/files/love_nikki_stylist_arena_imperial_ball.pdf
    • https://cdn.shopify.com/s/files/1/0469/4697/5905/files/submersible_trash_pump_canada.pdf
    • https://uploads.strikinglycdn.com/files/16ee686a-486e-47f1-bc64-4c837c8859a0/22074830434.pdf
    • https://uploads.strikinglycdn.com/files/59a53014-cae8-4b12-a1e8-92107897cef0/55638898902.pdf
    • https://cdn.shopify.com/s/files/1/0478/3331/7535/files/razidekalarag.pdf
    • https://cdn.shopify.com/s/files/1/0486/1834/0520/files/forklift_license_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3388/5846/files/226058078.pdf
    • https://cdn.shopify.com/s/files/1/0459/9031/4141/files/rotary_club_installation_of_officers_script.pdf
    • https://cdn.shopify.com/s/files/1/0498/3413/1655/files/44631046063.pdf
    • https://uploads.strikinglycdn.com/files/8543b86a-ca92-4ad1-b781-30d258b310dd/43760831634.pdf
    • https://uploads.strikinglycdn.com/files/4cefb9f7-9dd7-4d18-9543-1e877cfac214/rusotewivaguzefolunov.pdf
    • https://uploads.strikinglycdn.com/files/10807ebc-8343-4dc0-a993-be5036c9055e/visit_volgograd_russia.pdf
    • https://uploads.strikinglycdn.com/files/6c155752-caec-4ada-9c38-e442b37a1c33/68832397281.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082c6.bin
89bbab093de29340b38d02a85d8b4770f5450aeff1b59f2120f6f2d50b6cdbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C6 5384 bytes
font_01_sfnt_off00009535.bin
5045a771d032a4a54b7532254eb76e0dbb6d97085e4983d842fb214750a31e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9535 10992 bytes
font_02_sfnt_off0000ba41.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 16092 bytes

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