Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b93fd364abec90…

MALICIOUS

PDF

44.1 KB Created: 2020-08-18 15:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67196967d691e142662ea4335d3e8be SHA-1: a8fbe53474a19cc8356c56c413ab555e5ee0ce31 SHA-256: 72b93fd364abec903bbeaabafea3b229e040a4905cffc529168ca68f8fb21bb1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically directing users to 'https://ttraff.ru/pify?keyword=torch+browser+for+android+tablet+free'. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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=torch+browser+for+android+tablet+free
    • http://tobivo.northbayjudoclub.com/uploads/1/3/1/3/131378776/9916526.pdf
    • http://nikunu.slavuta-stylist.com/uploads/1/3/1/4/131453133/fujedesafa_tupumagapigufo_gekotubeperute.pdf
    • http://datatured.jenaforryaneyoga.com/uploads/1/3/1/0/131070382/5843572.pdf
    • http://files.loaraband.com/uploads/1/3/1/4/131437402/wafuganefizitoxaza.pdf
    • http://files.paddington-place.com/uploads/1/3/0/7/130740092/butetatagupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/fiwiriveni.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/19746993718.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/67674234106.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/verajuvudosoxozajarotupod.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9201/files/amelie_musical_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/titozatijosuwusur.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/30759368807.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/vinepoti.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/basic_english_grammar_for_class_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/apprendre_arabe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006165.bin
cf5f71c4bbd5c4d2ccaf18fb85f9a5d32e33598974751f43da0feb470727a8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6165 5080 bytes
font_01_sfnt_off000072a9.bin
6c4fb85fa125c5b4d25a5f55a94d660f031eedbda45e42efb61b6e1b4819dfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A9 10196 bytes
font_02_sfnt_off000095aa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AA 4324 bytes

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