Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c374e41497ae4a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 20:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c172eefc8b2469c87c96041762dedfd SHA-1: a6687d4cbe834e3442e8931111030b02175a5c09 SHA-256: 05c374e41497ae4a88f2f9040be96fad963399d968dbdadf68831bc0e2a5c16b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary link, disguised as an IELTS test, leads to `https://ttraff.cc/pify?keyword=ielts+sample+reading+test+pdf`, which is flagged as malicious. This indicates a likely attempt to direct users to malicious content or phishing sites, possibly as part of a link farm or SEO poisoning scheme.

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=ielts+sample+reading+test+pdf
    • http://files.irishblessingscoffeehouse.com/uploads/1/3/1/4/131407315/d88c95b500523dd.pdf
    • http://files.bouncyparadeboxers.com/uploads/1/3/1/3/131398244/5bab28d8.pdf
    • http://files.roadrunnerkitchen.com/uploads/1/3/2/8/132814067/terot_daxax_dumidixam.pdf
    • http://files.telluridepreschool.org/uploads/1/3/1/4/131482988/ede88521e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/75373331918.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5424/files/a_hat_in_time_modding_tools.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/brew_install_mysql.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/remobudome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/zemakajifuwarox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/65401448328.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/48166723207.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/23913558911.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/16290414598.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/xexevuzipovutedawawajosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/look_over_my_shoulder.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/mitoj.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_off00006d54.bin
04644519c17d92299a46145b4e15ac22472be9002b300c3667ba75503e9bd592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 5296 bytes
font_01_sfnt_off00007f42.bin
396f098b5d57d733ef853c60ad0de81a685572a1cbfb1a86a8a5eb242f0b873b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F42 10120 bytes

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