Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c243c30a5e1c114…

MALICIOUS

PDF

39.0 KB Created: 2020-08-19 08:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea84de7a551b2fb817ffaf0331e413f SHA-1: 7e21eaafaebd4953f8da35fdb976036892e8a444 SHA-256: 7c243c30a5e1c114fe318229c38b5af0bffc0e7ad4ff95b8f211f75ed9a69ff4
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which points to a known malicious redirector infrastructure. The document body, though obfuscated, contains text that appears to be a search result for 'cgminer windows 8 64 bit', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=cgminer++windows+8+64+bit
    • http://files.pedahzur.com/uploads/1/3/1/8/131860204/dixokojif-dajiwozu-zupojaliboka.pdf
    • http://files.lindenfestil.com/uploads/1/3/0/8/130874257/xofujunokanitit-zowijek-rarefi.pdf
    • http://faletif.tkccv.net/uploads/1/3/0/7/130776818/lazeketix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/att_uverse_channel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/9436306818.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/69385977876.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/98091438400.pdf
    • https://cdn.shopify.com/s/files/1/0450/9014/4421/files/archer_book_italic_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/bobomiregivevobedowikux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/plural_form_of_nouns_rules.pdf
    • https://cdn.shopify.com/s/files/1/0438/4129/0397/files/caslon_sb_regular_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/42888424917.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_off00005a98.bin
59aa289a9d97a5115e90322e4cb8e45a722e7164eacb0b2660e526919b4353d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A98 5476 bytes
font_01_sfnt_off00006d34.bin
c4549e2081706adce3d25d8b869d7f57a56d39f92c7802acf862437f3f109046
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 9968 bytes