Malicious PDF — malware analysis report

Static analysis result for SHA-256 650cc141d89bfa58…

MALICIOUS

PDF

42.3 KB Created: 2020-07-09 13:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 126e2cd08a774e66cdb925c46ee63994 SHA-1: 8fc4a67fc4f431132c4f6674650debeb3789a0a7 SHA-256: 650cc141d89bfa581ea1381a53262ff76e59c151ca75768d4f7cac0067e045e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded URLs point to a malicious distribution or SEO poisoning scheme.

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/wb?keyword=sekte%20u%20srbiji%20pdf
    • http://files.shawspringscanines.com/uploads/1/3/0/9/130969572/833917.pdf
    • http://files.maggieabril.com/uploads/1/3/1/6/131606550/nevujuzojunod.pdf
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdf
    • http://files.2ndchancesolutions.net/uploads/1/3/0/7/130775970/358ce6a3f2fc60.pdf
    • http://files.get-sorted.ca/uploads/1/3/1/4/131438500/dupevisikunejir-sexevadomab-sugisumuj-dumamuxujiti.pdf
    • http://files.livingstonslittlelearners.com/uploads/1/3/1/3/131398134/polevobomifopidif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sejidinaduk.files.wordpress.com/2020/06/tafofefotekabajuge.pdf
    • https://wamobujopo.files.wordpress.com/2020/06/dorovasurisutisizikuvumez.pdf
    • https://kavuduve.files.wordpress.com/2020/07/84324430055.pdf
    • https://relininomovu.files.wordpress.com/2020/06/31984346491.pdf
    • https://jarogife.files.wordpress.com/2020/07/36056552785.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.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_off000068a6.bin
2680ae74a0b7c263eb89938a6482fed4847512267b59f59de28baf68608a82b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 4840 bytes
font_01_sfnt_off0000792f.bin
a16f7adca63b558f930f5df666a322bea59668dcef22b3074e9c45d5a83ee71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10736 bytes