Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd55a391c41566…

MALICIOUS

PDF

46.2 KB Created: 2020-10-01 07:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a2a83178cd2501be27246a5535819a1 SHA-1: 3277176ab7949a2aed1e7d72b87dcd5d1c4e4ad2 SHA-256: b7cd55a391c41566ce89c96616b87192c3dd8d9a63f9b7ddf394394657cc276c
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirect to malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/strik?keyword=reservation+form+indian+railways+pdf, which is flagged as a known malicious redirector. The document's content, though heavily obfuscated, appears to be a lure for users to click these links, likely for phishing or malware distribution.

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://cctraff.ru/strik?keyword=reservation+form+indian+railways+pdf In PDF document text
    • http://jemob.deboresearchgroup.com/uploads/1/3/2/8/132815342/d27b5ac.pdfIn PDF document text
    • http://files.mdeasonphotography.com/uploads/1/3/1/4/131454316/rumidomutisufo-kudowu-kogoluwewimewaj-gofazerebi.pdfIn PDF document text
    • http://files.jeremyboros.com/uploads/1/3/0/8/130874567/8885746.pdfIn PDF document text
    • http://files.murciashoponline.com/uploads/1/3/0/9/130970001/wivilu.pdfIn PDF document text
    • http://files.borsodifinejewellery.com.au/uploads/1/3/2/7/132712369/vagowolezaxulu_rixonovekinede_zafefagawemuv.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/40588460484.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/loluxolunik.pdfIn PDF document text
    • https://site-1038532.mozfiles.com/files/1038532/31833327147.pdfIn PDF document text
    • http://wobun.buyschoolshirts.com/uploads/1/3/2/6/132681399/vagixikub.pdfIn PDF document text
    • http://files.clarabellum.com/uploads/1/3/0/7/130739945/wofopowev.pdfIn PDF document text
    • http://files.shop-osp.com/uploads/1/3/1/4/131483955/tegizunosif_dexowufar.pdfIn PDF document text
    • http://files.mylocalguideistanbul.com/uploads/1/3/1/4/131453969/misawageleganop.pdfIn PDF document text
    • http://files.sporcktileart.com/uploads/1/3/1/3/131384284/kupuzumomafuf_neronumuxepak_nujaza.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/1/0434/0085/5706/files/total_conquest_v_1._0._0_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1966/4541/files/gate_2020_syllabus_cse_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenixuraxolitater.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_off000073af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AF 5448 bytes
SHA-256: 940247074ee56bc852e1bdeed32bb3773a55b21dff7282eeca0d0970721ae2ba
font_01_sfnt_off00008646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8646 11068 bytes
SHA-256: 978ef66310f218a4a74c8c3773977ab07e8670cc115714de255ee72ac2eea3f1

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