Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fbec385d6c99d5…

MALICIOUS

PDF

41.5 KB Created: 2020-08-25 04:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bb6dc86cddfee78a881819bb840c1a1d SHA-1: 247086dae470285223619e2c586731ff275cdb5c SHA-256: d4fbec385d6c99d54ff87ceccfdc9c4820f33fc5b5044bdd7c7cae94418dacc4
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=4+pronged+approach+pdf In PDF document text
    • http://files.ecautoelectric.com/uploads/1/3/1/4/131437005/sizedivorolapasa.pdfIn PDF document text
    • http://files.guitaravenue-sg.com/uploads/1/3/1/3/131380343/5745034.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/1/0430/5226/9717/files/28594012169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/android_studio_gradle_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/40609646756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/81081003452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/english_story_book_with_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1178/0257/files/62893460084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/xowajikabosawivapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/bonjour_tristesse_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/format_dari_citra_bitmap_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2717/6343/files/duzopoduviwava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4423/1575/files/keropo.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_off00006464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 5200 bytes
SHA-256: d8c380b9fef5e303e977fff2c970f3f5cdc150c66c37889de88093e60ceeda4b
font_01_sfnt_off0000760e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 10424 bytes
SHA-256: 3a125d14b0ad8ca4b2dbf8b8eae6efa498628967c511d2eebbfe8e370db8e6b5