Malicious PDF — malware analysis report

Static analysis result for SHA-256 686712a2debcd6af…

MALICIOUS

PDF

65.5 KB Created: 2020-09-30 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 781a815cb2be1e36ba5f5caf472b014f SHA-1: 82d269526286737631c423762dc88f873b9098e6 SHA-256: 686712a2debcd6afa0065ea309d7a865ae15d98a3d881e512b84381bd7347cb5
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users seeking genetics probability problems. The presence of numerous external links suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive document content and malicious URLs.

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://gettraff.ru/strik?keyword=genetics+probability+problems+and+solutions+pdf
    • http://files.rlcraftvinylstore.com/uploads/1/3/0/9/130968913/58d13e628dd.pdf
    • http://files.fremontlocalfoods.org/uploads/1/3/1/4/131437295/lukurufifib-revipapawin.pdf
    • http://files.delcacao.ch/uploads/1/3/0/7/130739532/6216363.pdf
    • http://vedezip.hectorzenil.net/uploads/1/3/0/7/130740118/841586280c4f9d.pdf
    • https://site-1036812.mozfiles.com/files/1036812/kutizusum.pdf
    • https://site-1036721.mozfiles.com/files/1036721/64979454056.pdf
    • https://site-1036630.mozfiles.com/files/1036630/48182319341.pdf
    • https://site-1036955.mozfiles.com/files/1036955/ferufizuwad.pdf
    • http://guvefap.ndsportschannel.com/uploads/1/3/1/3/131379478/wusogepesifefe-timevijatefa-tilijipozoki-xiwawaxariduki.pdf
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdf
    • http://files.londonfoodessentials.com/uploads/1/3/0/8/130814172/pabovowuxesubisitexo.pdf
    • http://files.jonespaytonswimming.com/uploads/1/3/1/4/131437722/b03b7b868b8e88.pdf
    • http://files.artofmccabe.com/uploads/1/3/1/0/131070723/6650425.pdf
    • http://tuzawur.joysassgrace.com/uploads/1/3/0/8/130814241/zuvogesazomalurem.pdf
    • http://nuzevof.isc-shippingconsultancy.com/uploads/1/3/1/4/131453870/gopelajujo-kekatiri-xiginabi-fonutepe.pdf
    • http://files.samuraisharp.com/uploads/1/3/0/9/130969471/0f27fb623d772b.pdf
    • http://files.dheifetz.com/uploads/1/3/1/1/131164293/lamuzixe-pufovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a885.bin
40c8c1b1de3562636a4cd6cc1a0472f2affc081bda4eb2a85f7d8f053410c8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA885 5456 bytes
font_01_sfnt_off0000bafb.bin
c8efd85797462ea7fe320e2017bf3b92ff334e2e433082d8e663c206202daf69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFB 14996 bytes
font_02_sfnt_off0000e9fe.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 4324 bytes

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