Malicious PDF — malware analysis report

Static analysis result for SHA-256 41787f5d39155afc…

MALICIOUS

PDF

50.9 KB Created: 2020-10-02 21:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5fc90dadf7644161d0186d9f7e8f04c8 SHA-1: 2b737a13663616ffd0ea6e3f6080d9b72d3c15dc SHA-256: 41787f5d39155afc72649d90b69dd9f41a8b941d92db0c39afb8b0ad4f3d0b30
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://gettraff.ru/pify?keyword=fran+summoners+war+wiki In PDF document text
    • https://site-1036975.mozfiles.com/files/1036975/68401434397.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/47458774440.pdfIn PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/88224837257.pdfIn PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/mapukojevamow.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/74570518851.pdfIn PDF document text
    • http://files.needallthis.com/uploads/1/3/1/4/131411987/vubijatin.pdfIn PDF document text
    • http://mujolafuj.isgyaid.org/uploads/1/3/0/7/130775386/zalonefivuwizaxepizi.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/1/0433/4023/4917/files/persona_5_temperance_deadline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5323/9457/files/bujugunarupugubakimut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6932/7510/files/brian_bell_weezer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1064/8987/files/great_vibrations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/31466671111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/41425180803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3592/1050/files/hanging_plant_bracket_swivel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6300/3304/files/jojezokesule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2390/0565/files/38837757371.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 4912 bytes
SHA-256: 22e4444c6f28f03c51dd9b88345e493ad0a07d36b8f7db481ad421a80bdc157d
font_01_sfnt_off000085aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AA 10420 bytes
SHA-256: adbbd33615c45eb26b4faea39a060ea0cfca999bdc19af33745cf4e76ccee1a5
font_02_sfnt_off0000a952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA952 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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