Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc68efe69f528a8…

MALICIOUS

PDF

40.9 KB Created: 2020-08-01 10:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af3e02a25601d2bf7bad7a0ca525d857 SHA-1: a57f21b2b980b45f0e9b4effcf57c196da6f3176 SHA-256: 0bc68efe69f528a8d18c6fe113ab9df686ec74575b8acec98345a0b3d63b4bef
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download button, which is a common social engineering tactic. The document body and embedded links suggest a lure related to 'The Walking Dead' to entice users to click the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous PDF links points to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+walking+dead+online+subtitulada
    • http://files.goodeatsbyjeff.com/uploads/1/3/0/7/130739646/kirele.pdf
    • http://files.noticiasinternacionales.net/uploads/1/3/0/7/130775590/7193754.pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/bedojogoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/19525638819.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/bivaniforowakomutarubes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/57271108573.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/91929378500.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/17402073439.pdf
    • https://cdn.shopify.com/s/files/1/0437/7224/8215/files/32284508792.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7251/files/27369358799.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/jalekuzofuwuzuwofageju.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/tulazogojimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/61769414288.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/pukunofumapavudikojor.pdf
    • https://cdn.shopify.com/s/files/1/0439/8376/5662/files/45851302694.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0559/files/75432341207.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_off00004dd7.bin
9562132353ab0bfc1159785602dd3833374c26575a78124d551a0cf46267df31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD7 5236 bytes
font_01_sfnt_off00005fb7.bin
2fead605d2a84ee4b3c3bfb566c07a9edcd0d226b222fe8d7994f6833662fc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 9832 bytes
font_02_sfnt_off00008199.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 16060 bytes

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