Malicious PDF — malware analysis report

Static analysis result for SHA-256 4451f8943fdf0301…

MALICIOUS

PDF

75.0 KB Created: 2020-08-09 18:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6233d93a18430d4ed7e5212bbc6a2e SHA-1: 8bd37c022ce6d48e351141bbd922a37048a1d11a SHA-256: 4451f8943fdf03010c05503a443f485ce1e2ba4c264d74c59aabbdc323109137
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm behavior, with numerous links to PDFs hosted on various domains, including several on cdn.shopify.com and others on suspicious domains. The ML classifier strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.com/pify?keyword=speaking+criteria+pdf', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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.com/pify?keyword=speaking+criteria+pdf
    • http://files.elmontejunkremoval.com/uploads/1/3/2/6/132682745/xiwazum_polat_pijowogeminip_pozilulo.pdf
    • http://files.analyticalsci.com/uploads/1/3/1/1/131164473/baxujunoselivizuw.pdf
    • http://files.intensitystockwatch.com/uploads/1/3/1/4/131409009/buwixipefikiman-vebisesixu-noduxu.pdf
    • http://zabiga.incendiumarts.com/uploads/1/3/0/8/130874254/larufet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/holt_physics_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/non_disclosure_agreement_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/63493804983.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/carbapenems_mecanismo_de_accion.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/finunaketavekatudibuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/88983682177.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6063/files/dizionario_ceco_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/zixisativuxazidujanuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/xilunovijoredanukarukej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/29805145576.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/80313618241.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zukax.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/preguntas_consulta_anticorrupcion.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fd.bin
b038038232f042d15880d85c1a2b37e1b0958aa429b93025dc2536bda507f52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 5280 bytes
font_01_sfnt_off0000fc0c.bin
aae6dc656178c714844b55a001251e9857a58c5ddeea8886900ff4eb70abbd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10208 bytes

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