Malicious PDF — malware analysis report

Static analysis result for SHA-256 079ea0b383724d3e…

MALICIOUS

PDF

54.9 KB Created: 2020-08-11 18:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c04325e64389d0ad7eecd7f760d79a SHA-1: 2e71d60535470f8692949c706f7990687be26856 SHA-256: 079ea0b383724d3e7dc63d3d389964fc89538afdc8f652cbde8fd58f50ab6470
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=angielski+c1+%25C4%2587wiczenia+pdf, which likely leads to a phishing or malware distribution site. The document body, though partially corrupted, contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=angielski+c1+%25C4%2587wiczenia+pdf
    • http://files.waikikioutdoorcircle.org/uploads/1/3/0/8/130813846/322990046fc355b.pdf
    • http://files.expertrealtyllc.com/uploads/1/3/0/9/130968943/feb8a440.pdf
    • http://files.bandoliermusic.com/uploads/1/3/2/6/132695578/e65c42.pdf
    • http://files.ellesbookblog.com/uploads/1/3/1/4/131483327/5213484.pdf
    • http://rukebovot.cloeevents.com/uploads/1/3/0/8/130813765/birima_boluloj_padizaluze_lamimasetiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/92665674555.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/comma_splice_run_on_fragment_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/79350011392.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/boguxorov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9694/8382/files/barbapapa_new_house.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/55801309682.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/nefanatofejulogugozupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/51489072885.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/skype_or_blackberry.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/bhaavna_arora.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8405/files/kupawalugigebefa.pdf
    • https://cdn.shopify.com/s/files/1/0448/2092/2528/files/jurnal_standar_akuntansi_keuangan.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/back_propagation_artificial_neural_network.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ea1.bin
22939993143588ec4715aa93918faefaa22392cf641e41708f5da629e6046d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 5612 bytes
font_01_sfnt_off000091a7.bin
56b5f9db9ca26c7ac3333fd2e7be289ba68d914d8bccefc9cb6edbc589fabe67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A7 11820 bytes
font_02_sfnt_off0000b730.bin
7f10b5217708b7aced76a9c7cd02a51188d2af7235ea23585d094f6560042d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16248 bytes

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