Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d17069c43fb80bd…

MALICIOUS

PDF

46.8 KB Created: 2020-08-10 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878c27ffa99a4b94744e4ba38c003eea SHA-1: cf19f031f3ae05e1f8b776539feec06fa7cd4e30 SHA-256: 5d17069c43fb80bdfce4f19bb4b1ad2ab82ac3ddf0ce891df70e85b4741ab18a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the document's structure and embedded URLs point to a malicious distribution campaign.

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=inframundo+bernardo+esquinca+pdf
    • http://zokete.vi-vi.org/uploads/1/3/0/8/130814328/a95f82b5291.pdf
    • http://files.hollysmithsj.com/uploads/1/3/1/4/131453636/goduzonowoguzinex.pdf
    • http://files.chappellskc.com/uploads/1/3/0/8/130873717/gamanudi-feditigojivi-damezidete-fatosososupu.pdf
    • http://files.paulsumich.co.nz/uploads/1/3/1/4/131437044/28c77.pdf
    • http://files.abbigailrichardsmakeup.co.uk/uploads/1/3/1/0/131070711/3051543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/soxavulimosubegenanimukiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/nuxuxovewujamoxamoliwevi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/43218938672.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/concept_of_sustainable_development_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/janinetalar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/7932923948.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/bejenaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/league_won_t_open_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/paulo_coelho_alchimistul.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/arboretum_board_game_rules.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_off00006f52.bin
1d151e6d1e3941c779cd426f5463518ff7b1f81f3905935106dc4f3bc13333a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F52 5472 bytes
font_01_sfnt_off000081c8.bin
84daf345e21b08075a6e329eeacb0a13a0447ddcc3efc64e98a9a4ab9c6a9d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C8 1936 bytes
font_02_sfnt_off00008b09.bin
2b8628f1ed9cf7cbe30c86a5f4c622c5486618ad452448169c4c7956acbb716a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B09 10448 bytes

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