Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45b28f4d8ea17f4…

MALICIOUS

PDF

46.4 KB Created: 2020-08-26 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f27b2edf9ab708a7739d3674a0c0bc3b SHA-1: 62833fdf17972c4b2b76eea64285c45da96b95f7 SHA-256: f45b28f4d8ea17f408986d5dec83de3bcb698ac76a553110b437f4abd57c604f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=tarkovsky+sculpting+in+time`. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is `https://cdn.shopify.com/s/files/1/0429/2722/7036/files/electrical_interview_questions_and_answers_download.pdf`. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains these URLs, suggesting an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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.
  • 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://ttraff.ru/pify?keyword=tarkovsky+sculpting+in+time In PDF document text
    • http://xodusafez.cribusinesssystems.com/uploads/1/3/0/8/130813848/849594d.pdfIn PDF document text
    • http://files.incorporationofmasonsofglasgow.org/uploads/1/3/1/8/131856769/buvekarazikatuba.pdfIn PDF document text
    • http://sinovefez.territorialtales.com/uploads/1/3/1/3/131383664/mijixomupo.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/1/0429/2722/7036/files/electrical_interview_questions_and_answers_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8982/0838/files/knight_and_day_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0571/2296/files/recent_sales_notification_popup_fake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/50128749072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/42703504859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2013/2247/files/98525237826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/balearia_ibiza_formentera_tickets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/15594523972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/aha_bls_book_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/25655398717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/elementary_algebra_formulas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/ansiedad_social_definicion.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
stream_004_off0000785e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x785E 5428 bytes
SHA-256: c6183f144ab994f371ead8ea0c6841334c3f9e6c443e9ebfd855419d04ede4c5
font_01_sfnt_off00008ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD2 9908 bytes
SHA-256: 42fa2cd5b3b237bf769c4f0e5e6529aad90afa83eb874c42db928afba042b7cd

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