Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54994e6c68b3796…

MALICIOUS

PDF

41.5 KB Created: 2020-10-10 11:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7ae3dd4e7fd3d9ee7a1e2f5e6aeb2cb SHA-1: e575998f87fab221986fac0b1c3cbcfec3ffceb8 SHA-256: a54994e6c68b37962de8cc05ef0bf167bd641041033dc4c384df9ca6fa707811
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting, with one redirector pointing to 'ggtraff.ru'. The document body itself contains garbled text but includes the suspicious URLs, reinforcing the link farm nature.

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/pify?keyword=snohomish+county+gis+parcel+viewer In PDF document text
    • http://files.mackenzywatsonsportfolio.com/uploads/1/3/0/8/130873790/aaab4d6b1c7d1.pdfIn PDF document text
    • http://winuzen.mamathewsproductions.com/uploads/1/3/1/3/131379830/lomoropitoragunopu.pdfIn PDF document text
    • http://files.academiestjohn.org/uploads/1/3/2/7/132710683/8781209.pdfIn PDF document text
    • http://files.southfortyormondbeach.com/uploads/1/3/0/7/130774962/kuwejabav.pdfIn PDF document text
    • http://files.cabinwindypoint.com/uploads/1/3/1/3/131379037/pakowolad.pdfIn PDF document text
    • http://vesasi.friendlyvalleycountryclubwebsite.com/uploads/1/3/2/3/132303282/radelixig.pdfIn PDF document text
    • http://semeruzu.feathersalliance.com/uploads/1/3/0/8/130873848/5743694.pdfIn PDF document text
    • http://files.crosbyirontonmusic.org/uploads/1/3/1/3/131378993/aa1fd5a21b9.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/1/0431/7341/3032/files/unearthing_the_past_eso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1743/9902/files/66446625021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/why_is_peerless_network_calling_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/dadikos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3075/4966/files/dd_5e_pugilist_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf08c61a-b097-4552-9735-388629623de5/80994980188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83de617c-de85-497b-8d27-fe5df1aaed5c/wosibawezor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5887caa-7c72-4665-9104-90c1d41624f6/79971197833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c622ef5d-4444-4901-b22f-f44b7de2b0ba/80069095505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7b2cba-8351-4a41-8b21-e1a3ff948ea6/83606569220.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_off00006050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5704 bytes
SHA-256: 08ee52b6a6d250da618f8b8d2a79465fcb07b29a76324d9efaef9ac2db481904
font_01_sfnt_off000073ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 11176 bytes
SHA-256: eb0178db48e60d3c7ce61a0e7fb5c3bc336718511de601348d24e7d47cf65517