Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9feecb81716f77…

MALICIOUS

PDF

47.1 KB Created: 2020-08-07 21:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bd58bf6cc8c22d67efbed6864e7953d2 SHA-1: 377b7d76a1df7c357b017ef2cc55f9a5cb07a63b SHA-256: 5d9feecb81716f77d132a2275b5e56a4e1686366713bc3bdb78ca4ce2fb4ba75
194 Risk Score

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.cc/pify?keyword=benzoin+condensation+mechanism+pdf In PDF document text
    • http://files.northshorebostonrealtor.com/uploads/1/3/1/6/131606289/653055.pdfIn PDF document text
    • http://files.hairbyhkt.com/uploads/1/3/0/7/130776594/vulavimudepikas_sewidaf_xezawuj.pdfIn PDF document text
    • http://files.pickmuseumhmongexhibit.org/uploads/1/3/1/3/131384777/bivakegeranifebobuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1016/1829/files/16169385670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8842/9724/files/chopin_ballade_no_1_in_g_minor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/affaire_de_cur_tome_1_six_de_cur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9108/6750/files/cal_grant_gpa_verification_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/bexoxobotadurugak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9799/7991/files/20741733359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/xidejezomigesukibapizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/sumejenega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/mivobirixitib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/interpretacion_de_la_biometria_hematica_completa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/3597579729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/50583110254.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_off00007b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 5364 bytes
SHA-256: 743243df9bd37281dfda7491c9dc3501731e2e27ebbb85c41be2f0d7ce00bc9c
font_01_sfnt_off00008d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2F 10124 bytes
SHA-256: 83a04ad676fdd9708db7944e0030be11dab560fc2a872dd023da29e37fc13feb

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