Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08933c7f957c0a4…

MALICIOUS

PDF

48.9 KB Created: 2020-07-08 11:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 20af160630a3619d2a8d3e910af12685 SHA-1: 593e718bed18fa601276bfc20029522ac3d3421d SHA-256: a08933c7f957c0a4a1a37ee475960f584734323245bfed83d9452aec64fab7f8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic firing indicates a malicious redirector link, specifically `https://ttraff.cc/wb?keyword=macam%20macam%20media%20pertumbuhan%20bakteri%20pdf`, which is designed to lead users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=macam%20macam%20media%20pertumbuhan%20bakteri%20pdf In PDF document text
    • http://files.btowneventsnc.com/uploads/1/3/1/1/131163563/4102487.pdfIn PDF document text
    • http://files.imagezphotostudio.com/uploads/1/3/1/8/131856518/wufoxotatapa-forerid-seludidawopot.pdfIn PDF document text
    • http://files.saundersvet.com/uploads/1/3/0/7/130739769/e363f310302dd.pdfIn PDF document text
    • http://files.fitzwilliams.co.uk/uploads/1/3/0/9/130969532/kedokitovi.pdfIn PDF document text
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdfIn PDF document text
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdfIn PDF document text
    • http://files.sideshowscarnival.com/uploads/1/3/2/8/132814239/lexuxogapo_wugozopibip.pdfIn PDF document text
    • http://files.authorrebeccaarogers.com/uploads/1/3/1/6/131637034/wakobobo_jujorufaxeso_puxul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://diwunibe.files.wordpress.com/2020/07/tixereziguwet.pdfIn PDF document text
    • https://magebabug.files.wordpress.com/2020/07/kefulenaki.pdfIn PDF document text
    • https://xokapuv.files.wordpress.com/2020/07/87612270046.pdfIn PDF document text
    • https://jalejovit.files.wordpress.com/2020/06/darulazagipap.pdfIn PDF document text
    • https://zekofanakem.files.wordpress.com/2020/07/63120313353.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_off00007e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E40 5168 bytes
SHA-256: 7fe6807736f6cb3fb3670687dc4ec50277d369809259cb25c204ec5da9f2b5be
font_01_sfnt_off00008f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9E 12256 bytes
SHA-256: 9703e50c53b498457f99bf891ac6b2e753206819721ddf1ca549106e4e425f4f