Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a173d970912d85…

MALICIOUS

PDF

49.8 KB Created: 2020-10-28 14:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a9e20e475ccc230306ebc61f1b461ce2 SHA-1: 9b2ff4088fbf094b1366d4ac63b18a45cd5cc45e SHA-256: f8a173d970912d858557e29505649f16d97d5b2458d52541d863c99df665111d
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or are part of a link farm. One of the primary links, https://cctraff.ru/aws?keyword=starbucks+barista+coffee+machine, is identified as a malicious redirector. This suggests the document is designed to lure users to malicious sites, 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/aws?keyword=starbucks+barista+coffee+machine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f95932e60516.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/patevenebepil_fugape_rojoxirukali_gabixosogagi.pdfIn PDF document text
    • https://lewonodi.weebly.com/uploads/1/3/4/3/134330754/dc3af747e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f98f657a8f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f8b21aca2734.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/75cfd0e8757.pdfIn PDF document text
    • https://femekeviwafuga.weebly.com/uploads/1/3/4/3/134345727/5d43ba39c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_5f95d5ac19540.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/c44919c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8c3a449bc46.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/a3536bc.pdfIn PDF document text
    • https://xozoravupot.weebly.com/uploads/1/3/4/3/134314106/zizeforel_lowuxuvamokupa_tedatonuz_retenuzig.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/dumajapukixibi-kobifel-winimoletuso-radat.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/6e4f9bc5d332f.pdfIn PDF document text
    • https://xelefivaj.weebly.com/uploads/1/3/4/2/134234850/9e7b171bbe0b639.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/1/0497/0771/2691/files/xijonurifujawow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c02f525-35a4-45dc-9203-a3fa8a4e19e6/rgtsel_ballk_lei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e575c982-baa0-4f0d-9f50-c1b440e15b15/65826086690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6684/8933/files/runescape_2020_ironman_crafting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2176/0174/files/45018756268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1704/9516/files/go_math_grade_6_answer_key_lesson_3.10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f7e697-8cba-4824-b3f0-e8ca7164b882/gitomivaxuruwulusibib.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_off00007f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F47 5396 bytes
SHA-256: d411addf2531b49e898b02f3940f8b53ad5a8c8f348917d08eff0f3eca9e395f
font_01_sfnt_off00009178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9178 12056 bytes
SHA-256: 342ff70039ab3fa5a43f43557dd3d107be5b23c1d196ef362e0ffb031aa2de27