Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8543e68bc83add…

MALICIOUS

PDF

123.9 KB Created: 2020-08-06 19:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b57f07d35960a7bab8bb6a487da71f SHA-1: 3e8d932ae8fe23b89c31266e2fafdd33f010e740 SHA-256: 5b8543e68bc83add2840f11c78a3533cd3174ae50a266ecc248b2914c0f9bc8e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports this. The document body, though partially corrupted, contains text related to 'Libro 28 creencias adventistas pdf' and the authoring application 'wkhtmltopdf', indicating a lure to download or view a PDF.

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.ru/pify?keyword=libro+28+creencias+adventistas+pdf
    • http://vobamonod.tdabelew.com/uploads/1/3/2/6/132680813/gedufixugasul.pdf
    • http://kenixa.utilitystrikeavoidancegroup.org/uploads/1/3/2/6/132681947/7b099c.pdf
    • http://files.formormedia.com/uploads/1/3/1/3/131384470/b3186b4ee89.pdf
    • http://files.breezyshoresmininubians.com/uploads/1/3/1/8/131856409/2235705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/tozekabufataribog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/rozovusozoxala.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/bopenukapimovosabumasino.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/55245906004.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/rutax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/melojezurevinivamelu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/34322012487.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/punuwexepa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/tusil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/buxije.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_off0001a644.bin
c5c76063758282dad922c4366a904f1a385acddbfe4b029cb12b22c7729307cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A644 5584 bytes
font_01_sfnt_off0001b957.bin
a8e9fe14755f1e924713349c79bbc552f68cacd361288a542995d91f5c46f090
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B957 12136 bytes