Malicious PDF — malware analysis report

Static analysis result for SHA-256 e381a047f5c1c592…

MALICIOUS

PDF

42.2 KB Created: 2020-06-30 03:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 0638ff09f32c015a66e294c228cb89ec SHA-1: fc0242e221fa1f21d5d0bd75659609ddbf73334b SHA-256: e381a047f5c1c592575dec2090bbf119878f1bd8a4fd8bbc12922d04741219a8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to external PDF documents. One URL, 'https://ttraff.ru/wp3?keyword=annamalai+mp4+video+songs+free#annamalai+mp4+video+songs+free', is identified as a known malicious redirector. The presence of many such links suggests an attempt to manipulate search engine results or lure users to malicious content.

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://ttraff.ru/wp3?keyword=annamalai+mp4+video+songs+free#annamalai+mp4+video+songs+free In PDF document text
    • http://ohsnappicture.net/uploads/1/3/0/2/130287973/8372460.pdfIn PDF document text
    • http://files.johanneslavertonrestaurant.com/uploads/1/3/0/6/130604563/geveg.pdfIn PDF document text
    • http://perceptivecharm.com/uploads/1/3/1/1/131163828/venekogufek.pdfIn PDF document text
    • http://files.mrstruitt.net/uploads/1/3/0/2/130270938/2e870414725216f.pdfIn PDF document text
    • http://yajunshi.com/uploads/1/3/2/3/132302892/b2a558d.pdfIn PDF document text
    • http://lexmorshipping.com/uploads/1/3/0/5/130590355/xopakonan.pdfIn PDF document text
    • http://mta-sts.jansma.com/uploads/1/3/0/7/130776267/puxirav.pdfIn PDF document text
    • http://wesnicholson.com/uploads/1/3/0/2/130270987/4099145.pdfIn PDF document text
    • http://delwebbatcanebay.com/uploads/1/3/0/9/130969404/juput_ripaduz_vokarumidezoki.pdfIn PDF document text
    • http://dwrina.com/uploads/1/3/0/6/130621484/dizemomevoxavitona.pdfIn PDF document text
    • http://files.boondocksports.com/uploads/1/3/0/7/130738621/vufeleziri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://figanupa.files.wordpress.com/2020/06/jaritemaniwiwopo.pdfIn PDF document text
    • https://fuzejumif.files.wordpress.com/2020/06/30393698048.pdfIn PDF document text
    • https://kejivugufe.files.wordpress.com/2020/06/98255980176.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 5208 bytes
SHA-256: 6250bd8c578ac929a2511593a9194530182e0c33fb4609d52ebc8dd9046d98f5
font_01_sfnt_off00007756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7756 10776 bytes
SHA-256: cffaefbcc60d715684de78e39b7e771eb73d7e33262ff2e9867126dbfb041aa7