Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b09d0986999742…

MALICIOUS

PDF

42.9 KB Created: 2020-10-31 21:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c183ea69953ab42a9c2278eccb99b68b SHA-1: c27898c0f6a4f848b8fc567cd3c3a76a699bcbb9 SHA-256: 41b09d0986999742323a693964e7ed807774ad6ea0bdd91d185783011a462e75
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are embedded within what appears to be a link farm designed for SEO manipulation. The primary redirector URL, 'https://ttraff.me/pify?keyword=breathing+underwater+book+online+free', is flagged as malicious and is used to funnel users towards potentially harmful content. The presence of multiple S3 bucket links suggests an attempt to obscure the true destination or to host a large number of lures.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.me/pify?keyword=breathing+underwater+book+online+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f9664e44e8bb.pdfIn PDF document text
    • https://papilezuserif.weebly.com/uploads/1/3/4/4/134437149/notoxugisidi-kofibezifir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/zilerikidekebupateda.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/23397431412.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/17488239789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/limevisitutiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f3ad19-e47e-4f55-b8af-de130790ab2a/6006973586.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/call_of_cthulhu_shambler_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3391/7590/files/stellaris_ascension_paths_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/les_secrets_de_ayatoul_koursiyou.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/rezodogubunonevusamut.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/skf_bearing_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8D 5336 bytes
SHA-256: a3608c18ba590a62404f7e050f39315db9074c3b95655c4740d2c0db2de391f9
font_01_sfnt_off00007cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC4 10000 bytes
SHA-256: da1e94dfefb9a8c7bc275e1938acf911cbe734bd0c80df51ce1f2005807f2cbe