Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b10c365e8d328…

MALICIOUS

PDF

47.1 KB Created: 2020-10-12 04:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5fd7262086fdaf2e6948edf9ea3216a SHA-1: 974e22aee2dcdf10e616a307a7b552ced4d8fc8b SHA-256: a81b10c365e8d32821d1259220fe1b0bd11bc53eb5119d50b98c14e6d5e52fdd
184 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, https://gettraff.ru/pify?keyword=micros+9700+user+manual, is identified as a malicious redirector. The document's content, presented as a user manual, is likely a lure to encourage users to click these links, leading them to malicious infrastructure for further exploitation or phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/pify?keyword=micros+9700+user+manual In PDF document text
    • http://lututubaz.astoriabeneficialclub.org/uploads/1/3/0/7/130775710/3351244.pdfIn PDF document text
    • http://files.marriottediting.com/uploads/1/3/2/7/132712268/273632.pdfIn PDF document text
    • http://sufane.bluebellwoodflorist.com/uploads/1/3/0/7/130739978/8942313.pdfIn PDF document text
    • http://files.qrufundraiser.org/uploads/1/3/0/7/130776486/nuwarelebawuxi-jizaxeru-taxulasobup.pdfIn PDF document text
    • http://files.fischerworkshops.com/uploads/1/3/2/6/132683328/zovoxixatuvuvifuk.pdfIn PDF document text
    • http://mezeriv.wordplaygifts.com/uploads/1/3/1/8/131857120/laxogosex_desosizimunebit.pdfIn PDF document text
    • http://files.britttanya.com/uploads/1/3/1/4/131437834/2a96d7c0d4636.pdfIn PDF document text
    • http://sited.tnquarterhorsesales.com.au/uploads/1/3/1/1/131164112/wepabavebot.pdfIn PDF document text
    • http://files.ninatongthaispa.com/uploads/1/3/1/1/131164555/latuzusavebidamefig.pdfIn PDF document text
    • http://pupij.productionstudio29.com/uploads/1/3/1/6/131607239/3495664ba890.pdfIn PDF document text
    • http://vusumukil.moehrbetter.com/uploads/1/3/0/7/130738667/338aa1f2b.pdfIn PDF document text
    • http://zunixewo.trubluind.com/uploads/1/3/0/7/130739275/a16807cb425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB3 5328 bytes
SHA-256: 2a4ca085411d8e6f6fe59c9eff19a234dae915ebccbf001c5b493151e270d879
font_01_sfnt_off00008db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB4 9952 bytes
SHA-256: bc33c361811b682ab259ff5b7e0d94d71009dc07dfeeb938d2183349a104b6e7

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