Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aa72fb45842c5f…

MALICIOUS

PDF

42.0 KB Created: 2020-04-18 13:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 5b40b188b94ea9c57b1b473f3ba96263 SHA-1: aaf5e52d9559d33247f9db458fdbb320b8d20de2 SHA-256: 31aa72fb45842c5f0bf04439e2a4bdb80d1aa744094394dcfeb720f19e46bed1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and a single URL, which is also present in the list of extracted URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://jacs-schools.org/uploads/1/3/0/4/130483318/130483318.html#albums+free+reddit PDF link annotation
    • http://ncpsports.info/uploads/1/3/1/6/131637074/1368379.pdfIn PDF document text
    • http://onemayascend.com/uploads/1/3/0/7/130740244/794fd7f2f4d1.pdfIn PDF document text
    • http://mouserphotography.com/uploads/1/3/0/5/130539091/5099444.pdfIn PDF document text
    • http://healthydessertscatering.com/uploads/1/3/0/6/130621941/bab7f04b4.pdfIn PDF document text
    • http://fife-exhaust.com/uploads/1/3/1/4/131405940/0ddd5b286.pdfIn PDF document text
    • http://shaunrmcdonald.org/uploads/1/3/1/4/131406288/zapebunifutujaga.pdfIn PDF document text
    • http://devonopera.com/uploads/1/3/1/4/131453267/555d2.pdfIn PDF document text
    • http://smrestoreutah.com/uploads/1/3/0/5/130538986/wigugojigeje_vapalavenivo.pdfIn PDF document text
    • http://fertilitysister.com/uploads/1/3/0/6/130640183/be531500679a7.pdfIn PDF document text
    • http://skulptaesthetics.com/uploads/1/3/1/0/131069879/b79cd8b415a.pdfIn PDF document text
    • http://selfdrivesouthafrica.nl/uploads/1/3/1/3/131378932/8e0a23.pdfIn PDF document text
    • http://thecadets.com/uploads/1/3/0/6/130622033/woxuradukoto_xamuk_nuroxi.pdfIn PDF document text
    • http://96-gmc-sierra-sle.com/uploads/1/3/1/6/131636761/5890837.pdfIn PDF document text
    • http://cubcreekheating.com/uploads/1/3/0/6/130604795/dbe67.pdfIn PDF document text
    • http://www.tewkesburycookshop.co.uk/uploads/1/3/0/6/130620963/vokodavulaxejor.pdfIn PDF document text
    • https://bandcampIn PDF document text
    • http://freemusicarchive.4In PDF document text
    • http://audionautix.freesound.MoreIn PDF document text
    • http://publicdomain4u.ItIn PDF document text
    • https://imusic.Let���sIn PDF document text
    • https://bandcamp.org/TheIn PDF document text
    • http://beemp3sIn PDF document text
    • http://jamendo.comIn PDF document text
    • http://www.comIn 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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC7 8108 bytes
SHA-256: 92977d8a150df7175e650cbb4b0524063d0d7b83746badce81e2f9cbe408f896

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