Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3365a58d2d2d335…

MALICIOUS

PDF

40.9 KB Created: 2020-07-10 13:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 43ae65d87fd8e76de3330eff232caea8 SHA-1: 9571e849c611689e9b88e04ca035b98542dbf926 SHA-256: a3365a58d2d2d335df08086a0de9ae8e68ffcda4170879b63d3527d373b93c2e
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though partially corrupted, indicates a lure related to 'Norse gods and goddesses worksheet'. The primary attack pattern involves tricking the user into clicking these links, which likely leads to malicious content or further compromise. No scripts were extracted from this sample.

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.ru/wb?keyword=norse%20gods%20and%20goddesses%20worksheet In PDF document text
    • http://files.sheldonxink.com/uploads/1/3/1/4/131406274/8491542.pdfIn PDF document text
    • http://files.worldclasslanguagesolutions.com/uploads/1/3/1/6/131606175/tesejetexilo.pdfIn PDF document text
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdfIn PDF document text
    • http://files.mrohagan.com/uploads/1/3/0/9/130969085/6729064.pdfIn PDF document text
    • http://files.highbyte.com/uploads/1/3/2/6/132681448/jalumilesetofen_xedavavob_mopuloja.pdfIn PDF document text
    • http://files.thegroovedudes.com/uploads/1/3/1/4/131411024/daximubavilisubunili.pdfIn PDF document text
    • http://files.bradleyestates.co.uk/uploads/1/3/2/6/132682570/wirifobeje.pdfIn PDF document text
    • http://files.academicpointe.com/uploads/1/3/0/7/130775509/ef8f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zotevewu.files.wordpress.com/2020/07/78027180851.pdfIn PDF document text
    • https://dexuzonuluw.files.wordpress.com/2020/07/58128066329.pdfIn PDF document text
    • https://nojilibap.files.wordpress.com/2020/06/lekugisatepepuvubagirar.pdfIn PDF document text
    • https://runaxebeja.files.wordpress.com/2020/06/39292305136.pdfIn PDF document text
    • https://pamegalelumi.files.wordpress.com/2020/07/92213690858.pdfIn PDF document text
    • https://vinafomivama.files.wordpress.com/2020/06/tajikekupikeludode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/lobuzegegamojum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.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_off00006331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 4920 bytes
SHA-256: a88c990d675702c035dbb211d623c50eff1c9cb38a2df5f9060f01d2731df428
font_01_sfnt_off000073f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F5 10040 bytes
SHA-256: 9f9bc870ef157c0bdf473681ab494660c96dcc53edec4406faafd7692939ea19