Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2b21ec2d3832ea…

MALICIOUS

PDF

36.9 KB Created: 2020-10-29 15:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d308a9d2cab59d77c1c2ab2e77a5b7e4 SHA-1: 78428bb802a8cff4b519890e6eb0b5be81141b48 SHA-256: bc2b21ec2d3832eaaf527c2f223f933017952d3dfbdd23d87f86fb296e49be1f
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 document body, though partially obfuscated, contains text related to amoeba and references to wkhtmltopdf, suggesting a lure to external content. The presence of a link farm heuristic further indicates an attempt to direct users to potentially malicious or spam-related websites.

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.link/123?keyword=the+extension+of+pseudopodia+in+amoeba+is+due+to+the+regulated+assembly+and+destruction+of
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/sijop_sodoresapi_linibefijujob.pdf
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/aefa8.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdf
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/351117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasanag/viwimujidalazufev.pdf
    • https://uploads.strikinglycdn.com/files/dd335789-8a92-40dc-8d3e-7ed885850e56/1080829924.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/direnubituxalolatalizisaj.pdf
    • https://uploads.strikinglycdn.com/files/26777c0e-9b44-4d67-8700-23e68e5296c0/37274235966.pdf
    • https://uploads.strikinglycdn.com/files/e75410e8-cb7e-4535-98dd-aa8bf8df36e2/lajuxeranirilot.pdf
    • https://cdn.shopify.com/s/files/1/0482/8269/7889/files/descargar_manual_nikon_d7500_espaol.pdf
    • https://uploads.strikinglycdn.com/files/55d50262-488f-4d94-bc5c-cbdb2518af74/ancient_aliens_game_promo_code.pdf
    • https://uploads.strikinglycdn.com/files/f7486d31-f5a0-4439-af9d-e84ba785d9e5/dolezagusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9673/files/60307662678.pdf
    • https://uploads.strikinglycdn.com/files/d92fa95c-aa68-483f-b477-ed7d0b69e4ee/jusorujoxadiwefafax.pdf
    • https://s3.amazonaws.com/gorajikunobixi/68207645236.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f90.bin
8b35e405723be18049d597ac2f5c1c90c04a08d3e9215fdc5a14abdac7f5d68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F90 5828 bytes
font_01_sfnt_off00006349.bin
7c3db3c9cba19bf561fc5a42a7f9c16304c6a6cae81db3cd09b2c0e4fddc89b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 10096 bytes

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