Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3eecd94cfd73e5b…

MALICIOUS

PDF

58.1 KB Created: 2020-10-25 16:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: e6e173c504d4b8fcc77b68f7d342650c SHA-1: c7815791a29f007dae8fa0b9d6a9e639d3af501d SHA-256: f3eecd94cfd73e5ba4370c5dd0f5fab687f547507c63e76ce9fe58c5388cd92f
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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://gettraff.ru/aws?keyword=mb+publication+synonym+and+antonym+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8aed96e6329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f8d829a1114d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f87716600b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_5f9109eaa7bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f9282245f7bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f8fee8ce0ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f88ddf00d064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0843/2040/files/44258459007.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/anti_slavery_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/sebape.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/32336571214.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/wuzulesafo.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/aceros_arequipa_catalogo.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/czytanki_po_angielsku_dla_pocztkujcych.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/wusugobudo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/vumorujudevegitunowurixi.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/anestesia_epidural_vs_raquidea.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/xanadupugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/leadership_and_influence_skills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/49530005744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5221/0613/files/dewasevozewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5105/6804/files/umich_course_guide_ross.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a592.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA592 16612 bytes
SHA-256: 11638235de493ebdab559741b3ce0b5a94699f0ce18ac862f3db41b79c5e6527
font_00_sfnt_off00006d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 5452 bytes
SHA-256: d6f691bfe32d90a92e4e1fb6533dcc60c51436e44f1661bcdce645b27b538fdc
font_01_sfnt_off00007fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC6 11136 bytes
SHA-256: ed76aef4db401536c442719c22cf2d660e10c9a2599d00be134c7263c67027e0
font_03_sfnt_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 9084 bytes
SHA-256: 7aebf5ff82d6e3c625e423cc0718d8b0864a68a852512abc59992d1a79ff10e7