Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdc12f225ae8d0b…

MALICIOUS

PDF

39.2 KB Created: 2020-10-11 14:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a15f3729e1e28d8eca156aff1aafa506 SHA-1: 9b27781c72c82988c0b00deb889467348275cbb5 SHA-256: 3bdc12f225ae8d0b946479656d2aedbf70f5a582f1d0db070e8419426e9326d8
224 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or known redirectors, indicating a link farm for SEO manipulation or to distribute further malicious content. The presence of a malicious redirector link and numerous PDF links on disposable hosting strongly suggests a malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cctraff.ru/strik?keyword=greeting+card+template+printable+free In PDF document text
    • http://files.dandelionkisscustomphotojewelry.com/uploads/1/3/1/3/131383813/eac0feef30d.pdfIn PDF document text
    • http://files.maurobernasconi.net/uploads/1/3/1/0/131070187/a4c6203d26e0e.pdfIn PDF document text
    • http://fejozako.capitolcitytrailers.com/uploads/1/3/2/8/132814930/19910.pdfIn PDF document text
    • http://sevujo.teambor.com/uploads/1/3/2/7/132740478/9351675.pdfIn PDF document text
    • http://files.cxgreenworks.com/uploads/1/3/1/4/131438539/powonef.pdfIn PDF document text
    • http://lupudi.deborahjonessherwood.com/uploads/1/3/1/0/131070581/rijado-moxubanuti-xigije-nekifas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7493/6994/files/betty_greys_anatomy_season_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/rivofofanepulukuwuxan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/21546060853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5953/0914/files/worksheet_newtons_2nd_law_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0837/6482/files/turososu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379b0337-3e02-4806-bb08-1e0302536f5d/18448682422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb9c6d1-3f36-4872-bf86-4e82e0a944b4/14667091809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/812316ab-9f2d-451d-bb97-c8208ef72721/97416257233.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_off00005b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B64 5468 bytes
SHA-256: 37b6278c12af8dcb7c03ae1b60147a490c357e424f8f616c1bad3e3d472f8ada
font_01_sfnt_off00006ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DED 9812 bytes
SHA-256: 74bd571034f611f28340722a0a45281ffdba98c86f69ccbf71595ae36f3f1980

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