Malicious PDF — malware analysis report

Static analysis result for SHA-256 18be863a1228ac4d…

MALICIOUS

PDF

42.0 KB Created: 2020-07-27 20:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e89c31c6c7aa4e41ecf350878f2d813 SHA-1: 4a0cfc0b04f84c86d3766c2c12debc44a2b5899f SHA-256: 18be863a1228ac4d679c2bbbe66c3e1d15b3e11606c1b13ccf7053a2ae07a34d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

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=bhojpuri+gana+video+may+2013
    • http://files.thecbdjunction.com/uploads/1/3/1/4/131438353/1365369.pdf
    • http://files.theteethdr.com/uploads/1/3/0/7/130775970/4056856.pdf
    • http://files.curebalm.com/uploads/1/3/1/8/131856071/4141314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/75713440307.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/51845425006.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75278808376.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3099/4326/files/56067390832.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/jegiberesuraguveji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2105/files/pokepilo.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_off0000653b.bin
1d9e5f056c5dafa9181ce90ca9362b96371344f82fe21085a9fa70d82817ac04
pdf-font-stream PDF embedded font (sfnt) at offset 0x653B 5744 bytes
font_01_sfnt_off000078af.bin
14db43ba3c2570d4dc1abead0ffc20a9aee00b968a4d2874afca0476deb47ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 9836 bytes