Malicious PDF — malware analysis report

Static analysis result for SHA-256 160efb8af6eee37b…

MALICIOUS

PDF

38.6 KB Created: 2020-08-10 12:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1124fc57be7e006b0f91b16722dd11b SHA-1: 6b653ec6bb881cd3b6d09e913f2112ccc391b16b SHA-256: 160efb8af6eee37b97b21f0130c289884ee139cb381fabadf0534be1c6fdf39e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially garbled, includes text related to 'past simple irregular verbs exercises' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a link farm and a malicious redirector indicates a likely attempt to funnel users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=past+simple+irregular+verbs+exercises+pdf+1+eso
    • http://files.victoria13gla.ca/uploads/1/3/0/7/130776060/rutedigasefo_ripekinal.pdf
    • http://xunezixo.elisecillustration.com/uploads/1/3/1/6/131607712/nonabupoj.pdf
    • http://files.browngirlpen.com/uploads/1/3/1/4/131408432/wawolubujelu_belorixefesepuj.pdf
    • http://dovupir.noirfashion.net/uploads/1/3/2/6/132695569/86eee326de.pdf
    • http://files.domesticfabrics.com/uploads/1/3/2/6/132681213/e39174837ab14c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/bozijukikaxudodusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/21702231417.pdf
    • https://cdn.shopify.com/s/files/1/0455/4794/6149/files/weberezizezarof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/89080838745.pdf
    • https://cdn.shopify.com/s/files/1/0438/0760/4896/files/gabokorovetizezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/36997589703.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/losiluvavasiraxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6389/files/88185807647.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/convert_arabic_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/31180192573.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/78159795907.pdf
    • https://cdn.shopify.com/s/files/1/0435/7265/8335/files/christian_community_bible_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/48940945086.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ef.bin
3f54ebbfc4bd66d0e5b1c6218b83e7fa6557e812b0ddbf06d7a136d9c6990ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EF 5796 bytes
font_01_sfnt_off00006a9f.bin
453b49942d1d8c6781e415633508a30372788e83e6acc0f03d93d4588ad24b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9F 9944 bytes

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