Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bc51b2945d2a0c…

MALICIOUS

PDF

61.4 KB Created: 2020-08-31 04:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf2d98eb055b80cac148666941601da3 SHA-1: cc6263d618adea996748a77f0c2736ac6df1bdd5 SHA-256: 13bc51b2945d2a0cde2308d86cfd05dc3f22103745029967f95201094cd457c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. This suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

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/wix?keyword=tabla+de+valores+de+funciones+trigon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0967/9265/files/bawuzanejuwesimutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/allshare_cast_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/bubble_shooter_hd_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0910/files/70982419391.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/pobaseg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7732/0348/files/65333968269.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/atypical_hemolytic_uremic_syndrome_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/givopamaxus.pdf
    • https://cdn.shopify.com/s/files/1/0432/9039/4788/files/wuwusumetiwevimalemugo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/tom_and_jerry_magic_ring.pdf
    • https://cdn.shopify.com/s/files/1/0465/0359/2094/files/brigantine_nj_surf_fishing_report.pdf
    • https://static.usrfiles.com/ugd/e4a001_aebfc9cbbd1940539afe006308657d4f.pdf
    • https://static.usrfiles.com/ugd/3f4b99_3c4fea24920c4822a1478999263f1b7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7688f2dac40144ceaca5451b89990ba2.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_off00008c86.bin
0b396b0b1f584e854c69e652ee9ab6bee84dc669621ae6cc0eb4aa232a7f8675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C86 5340 bytes
font_01_sfnt_off00009ec6.bin
af78dd97fdae23051d14d88c63c0179f09cafdb3d229b3b62812a144dda7b0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC6 16436 bytes
font_02_sfnt_off0000d1b3.bin
0df469ace8b4ae32ddae26db737700b3392f1fb76fa011a6c64c309f4ff08844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 16064 bytes

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