Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f94425ac1a9363…

MALICIOUS

PDF

87.0 KB Created: 2020-08-08 17:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4894f903641b76da29401986c795687 SHA-1: 58b930e5bbfcb84d67dfbd55298959dffd289eee SHA-256: 52f94425ac1a9363c5277542aeeebf315aa7edbf0b5d359cdfbe391512aea7b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=tabel+asmaul+husna+dan+artinya+pdf'. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be the malicious links.

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=tabel+asmaul+husna+dan+artinya+pdf
    • http://files.nicoledigiacobbe.com/uploads/1/3/2/8/132816096/latovi.pdf
    • http://fidejevo.graevesautoandappliance.com/uploads/1/3/1/3/131398140/9283768.pdf
    • http://files.gavingateway.com/uploads/1/3/1/3/131383456/faxelalug.pdf
    • http://files.vintagevibelou.com/uploads/1/3/0/7/130776386/jalajapalexuwej.pdf
    • http://files.bertleffel.com/uploads/1/3/2/6/132681477/ruxokaledetomalup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/60398726797.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/gofulej.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/labezoxejazidan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/17901942397.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/wugufodipij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/movie_genres_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/1224450730.pdf
    • https://cdn.shopify.com/s/files/1/0448/1276/3298/files/que_es_un_arduino_y_para_que_sirve.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/passive_voice_exercises_basic.pdf
    • https://cdn.shopify.com/s/files/1/0447/8078/1734/files/brussels_tram_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/feruzumare.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/44492774301.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8167/files/zozatariparajofeve.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
stream_005_off000119bb.bin
a58dc5043c64c68854f5e66e51b7fa316413fd525d8fe9b0539b97c31c0b744b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119BB 30064 bytes
font_00_sfnt_off0000e32b.bin
50fc1903732c770ffb8bad52aaac8e4294f12bfafea7e435e5e74ccbd45928f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 5472 bytes
font_01_sfnt_off0000f599.bin
17f9d0fe32a1a50400f7ded9f4bfb9e028467159380c9fcb0b454bfcf3bb40c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 10524 bytes

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