Malicious PDF — malware analysis report

Static analysis result for SHA-256 1705ff71023d741f…

MALICIOUS

PDF

89.6 KB Created: 2021-01-10 08:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9611f83a3df3025593e3b206194332b4 SHA-1: 9fe3702805365ed390358373cd94cf4cd8c20cb9 SHA-256: 1705ff71023d741f3f50e6d549f5531f36972b4b8e7a88a40facc080864fa794
124 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to known malicious redirector infrastructure, specifically targeting users with a 'free Robux' lure. The ML classifier strongly indicated maliciousness, and the document structure suggests it's part of a link farm designed to distribute malware or phishing content. No scripts were extracted, but the primary attack vector is the malicious redirection via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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 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://ggtraff.ru/123?utm_term=free+robux+inspect+script In PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/crowdfunding_campaign_names.pdfIn PDF document text
    • https://site-1177303.mozfiles.com/files/1177303/reapers_revenge_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5faa52dee70e3.pdfIn PDF document text
    • https://site-1178208.mozfiles.com/files/1178208/4192715610.pdfIn PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/sotovi.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/the_max_omaha_events.pdfIn PDF document text
    • https://site-1209851.mozfiles.com/files/1209851/7137187634.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/ib2ii3A/pocket_bully_size.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/hjjItgh/83016039854.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/ggjajfH/genetanulotudosipemovagi.pdfIn PDF document text
    • https://site-1176085.mozfiles.com/files/1176085/notepad_plus_plus_file_compare_plugin.pdfIn PDF document text
    • https://site-1176941.mozfiles.com/files/1176941/zuxagarolepafit.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/trw_power_steering_pump_cross_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/72657966538.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010649.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10649 14804 bytes
SHA-256: 939b44cc45f9e5acb74b959451bb6ad3b4c36e5fe0f7a4683ecef38667eb03e3
font_00_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 4848 bytes
SHA-256: 231bc7758d34c245978a7bb7c5a38243330b97f9ec7edcefcd0218febc2edf4c
font_02_sfnt_off00012fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC0 12192 bytes
SHA-256: 4b3ddad2b7d79d1d2c86dcb5134584126b61450b0a39c4afb2d5a87d4e3bb2db

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