Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afbd202976b0785…

MALICIOUS

PDF

45.4 KB Created: 2020-08-12 09:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c7a9f1481d1b1007e13e222ef19b08b SHA-1: 488fea5480c7ef3366ab7468d41bf10b44981b8a SHA-256: 7afbd202976b0785b69392ea75e04ccb1f14c14d0bf7d5a0f465c0fc72f52688
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/pify?keyword=german+language+for+beginners+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=german+language+for+beginners+pdf
    • http://files.cedarhillsoaps.com/uploads/1/3/0/7/130776015/dujewopuwiloj_xewizozaxudoja_xuvexi.pdf
    • http://files.nycea.org/uploads/1/3/0/7/130776088/fematawilu.pdf
    • http://files.jennifercrallpsychology.com/uploads/1/3/1/6/131606954/2048207.pdf
    • http://files.wilbanksreptiles.com/uploads/1/3/1/4/131407057/d84ce4.pdf
    • http://savesa.triobistro.com/uploads/1/3/1/8/131871699/gopamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/42341856022.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/griffiths_quantum_mechanics_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9062/5191/files/tabadetixeteziki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/8040677635.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/wutosinufisap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1864/1830/files/andrs_manuel_lpez_obrador_libros.pdf
    • https://cdn.shopify.com/s/files/1/0441/3780/8024/files/urdu_taqreer_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9767/files/16755518893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/riponagov.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660e.bin
3e7ea1429129e9c7d509f5d4d46878144336d30306c83e62bcd674675b15ea3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 5336 bytes
font_01_sfnt_off0000780d.bin
ac302e8ebeeb0e44c6f4b58433a4cc87101b1cb53202413967205be609e47a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 10060 bytes
font_02_sfnt_off00009a83.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A83 4324 bytes

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