Malicious PDF — malware analysis report

Static analysis result for SHA-256 a590be59f71afde8…

MALICIOUS

PDF

43.8 KB Created: 2020-10-15 18:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ce061d9790e07ddf0e2a4e7322daddc SHA-1: 3a5bbb1f4cb716da419a2f39168f95882aa65a1f SHA-256: a590be59f71afde878f0da02d2ce56fddc8c80d10e2f8442fd7baca7b2998dd4
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ggtraff.ru/123?keyword=android+studio+button+listener+example, points to known malicious redirector infrastructure. The document body and embedded links suggest a tactic of creating a link farm to either improve SEO for malicious content or to redirect users to potentially harmful sites.

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://ggtraff.ru/123?keyword=android+studio+button+listener+example In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/10d616.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4171977.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/wuloxogujot.pdfIn PDF document text
    • https://site-1043204.mozfiles.com/files/1043204/pezixu.pdfIn PDF document text
    • https://site-1043923.mozfiles.com/files/1043923/ligufasopinubu.pdfIn PDF document text
    • https://site-1040299.mozfiles.com/files/1040299/25000852037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b92f84e-eb85-40a9-b391-e7eac3262419/vozokurilivekumodif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f443c0-a82c-4a48-bb07-cee565fd6782/vekulozonuziralozego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7059422a-cc30-4342-8ee8-1d7b2d1145e6/59644528568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21d8287-ca47-4654-aef7-5752bf10095e/bovunidenax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8938/5890/files/blackmart_android_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4630/0576/files/romance_bollywood_movies_2006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0518/8515/files/english_file_intermediate_third_edition_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1392/2201/files/need_for_speed_underground_2_trainer_unlock_all_cars_and_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320849e7-8f8b-4ead-9b06-cb67f01c495d/12276136594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27be5523-ec28-400a-9b5d-1d69027c2e5b/86411701640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff193195-ee5b-477d-b975-75bae4799e74/ditusizibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fba1f02-cb29-4648-b7f5-101b573ef811/45398130440.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_off00006c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 5300 bytes
SHA-256: ce636ec74f46926602669e2d0a409e41ba15dafe79394f02896f6dbad9f47bb9
font_01_sfnt_off00007dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFB 10540 bytes
SHA-256: 12efc27d50354eb5277cdb71cf56ba4e367f89827291d720cf3a5866aff06f6c