Malicious PDF — malware analysis report

Static analysis result for SHA-256 141dbcfd6a81119e…

MALICIOUS

PDF

61.6 KB Created: 2020-08-17 05:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92d95a4a1a5845eddd16e2ef9a304d93 SHA-1: a7941078f8566f3578131aa979a1988284161de7 SHA-256: 141dbcfd6a81119e881466506b16d1d619e4e3059837485d61fd15bcffc74c4f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious links is a strong indicator 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.cc/pify?keyword=the+electoral+process+worksheet+icivics+answer+key
    • http://files.goodlooksbeautysupply.com/uploads/1/3/1/4/131409677/zuvasisawok_fufifalebese.pdf
    • http://files.thursdayartmovement.com/uploads/1/3/1/0/131070846/terulutawidibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/53798887727.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/gukijavovarerid.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/visual_basic_6._0_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/81132434594.pdf
    • https://cdn.shopify.com/s/files/1/0447/6348/0215/files/adegenet_r.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/96242880845.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/modesabox.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/aprendizaje_segun_varios_autores.pdf
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/convert_to_bitonal_tiff.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/by_products_of_rice.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/disney_medley_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/gajaluresuxixiwuji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a13a.bin
ee6d5690e6850ad7025d8ecf2eb991cbdd5bf4a72cdce38a8de45f516adfd923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13A 5076 bytes
font_01_sfnt_off0000b27f.bin
28721dd9688838565bb69313a3073e541d3e4d5277f674f1fb05968636e1fdf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 12380 bytes
font_02_sfnt_off0000da8f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 4324 bytes

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