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) First seen: 2020-09-04
MD5: 126e2cd08a774e66cdb925c46ee63994 SHA-1: 8fc4a67fc4f431132c4f6674650debeb3789a0a7 SHA-256: 650cc141d89bfa581ea1381a53262ff76e59c151ca75768d4f7cac0067e045e1
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to redirector infrastructure designed to lead users to malicious content. The document body text, though obfuscated, includes the phrase 'Sekte u srbiji pdf' and a URL to a redirector, suggesting a phishing or scam lure. The presence of many generated PDF links further indicates an attempt to distribute malicious content through SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.shawspringscanines.com/uploads/1/3/0/9/130969572/833917.pdfIn PDF document text
    • http://files.maggieabril.com/uploads/1/3/1/6/131606550/nevujuzojunod.pdfIn PDF document text
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdfIn PDF document text
    • http://files.2ndchancesolutions.net/uploads/1/3/0/7/130775970/358ce6a3f2fc60.pdfIn PDF document text
    • http://files.get-sorted.ca/uploads/1/3/1/4/131438500/dupevisikunejir-sexevadomab-sugisumuj-dumamuxujiti.pdfIn PDF document text
    • http://files.livingstonslittlelearners.com/uploads/1/3/1/3/131398134/polevobomifopidif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sejidinaduk.files.wordpress.com/2020/06/tafofefotekabajuge.pdfIn PDF document text
    • https://wamobujopo.files.wordpress.com/2020/06/dorovasurisutisizikuvumez.pdfIn PDF document text
    • https://kavuduve.files.wordpress.com/2020/07/84324430055.pdfIn PDF document text
    • https://relininomovu.files.wordpress.com/2020/06/31984346491.pdfIn PDF document text
    • https://jarogife.files.wordpress.com/2020/07/36056552785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 4840 bytes
SHA-256: 2680ae74a0b7c263eb89938a6482fed4847512267b59f59de28baf68608a82b7
font_01_sfnt_off0000792f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 10736 bytes
SHA-256: a16f7adca63b558f930f5df666a322bea59668dcef22b3074e9c45d5a83ee71b

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