Malicious PDF — malware analysis report

Static analysis result for SHA-256 60fec7dcf91c2d54…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 17:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a7e77168d787f2870f2238955c2eaa SHA-1: 630641ca7dd6bf3a6dbda7f88bf8436edd36d0c8 SHA-256: 60fec7dcf91c2d541f311a6c9a7c94538a24813b920bee936a67cf6371ed79f0
162 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Kcet 2020 answer key pdf' and embeds multiple links. One of these links, 'https://ttraff.cc/pify?keyword=kcet+2020+answer+key+pdf', is identified as a malicious redirector. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect 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.cc/pify?keyword=kcet+2020+answer+key+pdf
    • http://files.adarksouvenir.com/uploads/1/3/0/7/130775102/xonasovolejanuzed.pdf
    • http://doxujosi.finsfurguide.com/uploads/1/3/2/7/132712207/4749742.pdf
    • http://files.eriksbracelets.com/uploads/1/3/0/7/130739204/zogofem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/download_novel_battle_through_the_heavens_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/katedaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/xisinaxanat.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/48685410591.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/xifekutifisazigitiri.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/zebefupirexuxojejinobiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/binisefegom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/age_of_empires_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/0041/2835/files/centrifugal_casting_seminar_report.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_off00005dfb.bin
85869833e9def942acfd8f9cb874af3f043794ce6dee0638f35563110023d0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFB 5620 bytes
font_01_sfnt_off00007136.bin
82b7ba70af4b16133d9213395af9a49c8b9edb0cf8946fbcb725d496e5074469
pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 9968 bytes