Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abf3adf2b0c3789…

MALICIOUS

PDF

56.4 KB Created: 2020-10-01 05:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25635a433dcc07207d0b08aee4ec48a3 SHA-1: 75e0b93de8f2c7d948df08973b9cd5a9c21d2889 SHA-256: 3abf3adf2b0c3789f85266fafbda5bdf9f4393cc945da041a36ec9280a8d3720
192 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to link farms hosted on disposable domains, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and one of the embedded URLs is identified as a known malicious redirector. The document body itself contains text related to the search query and the PDF creation tool, suggesting it's crafted to appear as a search result.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=history+of+islam+in+urdu+pdf+download In PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/48049429323.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/vutixitapila.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/jefikewokewej.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/69786021699.pdfIn PDF document text
    • https://site-1039490.mozfiles.com/files/1039490/81612392014.pdfIn PDF document text
    • http://files.brentsawicki.com/uploads/1/3/1/1/131163793/nekozus_vogip_futaf_xepejogal.pdfIn PDF document text
    • http://files.southernboneworks.com/uploads/1/3/2/3/132303138/89fea9.pdfIn PDF document text
    • http://files.greenhopefinearts.org/uploads/1/3/0/7/130775647/rutogafilekujar_gagogigopoda_kaxipo_welinozeme.pdfIn PDF document text
    • http://files.rustybucketacres-store.com/uploads/1/3/2/7/132740309/b19c858.pdfIn PDF document text
    • http://namiki.maertensmilano.com/uploads/1/3/2/3/132302815/wixemonixezazukaluna.pdfIn PDF document text
    • http://files.sherriobermark.com/uploads/1/3/1/1/131163620/bawefobojula.pdfIn PDF document text
    • http://pimovuri.roughridernews.org/uploads/1/3/2/6/132682790/6123392.pdfIn PDF document text
    • http://lagotekip.menehunebasketball.com/uploads/1/3/2/3/132303382/f4dd37b925eb960.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/1/0438/9748/7512/files/munupuregukadexifugudupod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/zolpidem_20_mg_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/50714726973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/brave_new_world_revisited.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2291/2157/files/xixelomovajuwoduxi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a8f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA8F0 25284 bytes
SHA-256: fb989486332397d2eed7f289bc2414b740ba8173fb4052b20aa94a757c5f3675
font_00_sfnt_off0000743c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x743C 5344 bytes
SHA-256: fc2ad4ded4d1ae570960eadb07221823433260a5acac5de6994352f5bc67490a
font_01_sfnt_off00008667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 10076 bytes
SHA-256: ba051d4c0c3b7df61321770e1fc2b7aeeb716dbb48450879ba05224a297af664