Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139cb7dc1a682c8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-05 14:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d23ab70da7b8726241f5007f7bdc7b SHA-1: 47df3fb3a01c3c095a23be0ad41fea02c48d1297 SHA-256: 7139cb7dc1a682c8138437ed34464b822804a0cf54b9f502fe1e6c991390aaa8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution vector. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious infrastructure.

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=calendario+2020+para+imprimir+pdf+chile
    • http://files.strategic-team-building.com/uploads/1/3/2/6/132682542/ffd415a9f0.pdf
    • http://files.perfectprotection.shop/uploads/1/3/2/7/132740253/1339716.pdf
    • http://files.kcsaussies.com/uploads/1/3/0/7/130739011/486561.pdf
    • http://files.bombni.com/uploads/1/3/1/8/131871787/ruweg-madekurep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/78055212016.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/wenifarovevudak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/98297543364.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/43026112420.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/24875306593.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/2644102802.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/90437737215.pdf
    • https://cdn.shopify.com/s/files/1/0431/9382/7485/files/7818615649.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/lala_ramswaroop_ramnarayan_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/36128301874.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_off00005561.bin
f089e0f7ef7f0d2c32d494640b853ac5b5bee29b2448595d1dc378802af10635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5561 5396 bytes
font_01_sfnt_off0000678c.bin
95df4635a904a5a0762abfcd5559cc6b0d43ef98aacb859ce17ceaafd759c17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678C 10652 bytes
font_02_sfnt_off00008a76.bin
0f4d0f358c2d894ff747574abb878dd79aa9708636309e7ac76823d229b699fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A76 16436 bytes

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