Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c5a694bc2c1d1d…

MALICIOUS

PDF

48.5 KB Created: 2020-10-03 17:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 75b7e107fdc79533f88e150598b707a3 SHA-1: 41067561c936f1afc8f0682e0ba9174ebdc9d5ce SHA-256: 88c5a694bc2c1d1dc1f93a47ccd02a1fe8439a6b7f00d2479648e16e69f3f24b
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/strik?keyword=enterprise+coursebook+1+4+pdf+mp3+avi In PDF document text
    • http://files.campcenterstage.org/uploads/1/3/0/7/130740297/3601036.pdfIn PDF document text
    • http://dakojagis.annasunchoi.com/uploads/1/3/1/4/131407572/b0baac555.pdfIn PDF document text
    • http://xuses.warrenplainsbaptist.org/uploads/1/3/2/6/132695925/paxik-jigefujowubi-nemeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/what_do_you_call_your_grandpas_brother.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6681/4375/files/tobins_spirit_guide_ghostbusters_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1064/4377/files/santa_teresa_espirito_santo_brasil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/fingerpicking_worship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/what_does_icloud_locked_mean_on_my_ipad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4897/9617/files/32860862161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/sudubatopagazir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5152/0678/files/chemistry_worksheet_lewis_dot_structures_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/693764187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1347/4984/files/bebo_norman_britney.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0993/7045/files/pifazaralixidaxivamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/4_square_receive_antenna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/31238279944.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1C 5676 bytes
SHA-256: 47380a979eb13b8dfefabf58cba9c4c39126c782da9fec195e211e8e77e2f645
font_01_sfnt_off00008056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 11868 bytes
SHA-256: cb4b08576578ea3935a7987c52b9a7e2be81f01035ebc904ff3b48bbe0b0b84f
font_02_sfnt_off0000a6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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