Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1875a8a667e06…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 09:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7817d23683662f6cd5c2b16650afb4eb SHA-1: 205ec405331b941b533f29a8c9a875124b4c8a7b SHA-256: efd1875a8a667e065102237871370d8dd5297592c4cde6a2d65a6abbb8702dcd
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.com/pify?keyword=autodesk+sketchbook+mobile+manual+pdf In PDF document text
    • http://files.lyndajenkins.org/uploads/1/3/0/9/130969065/xemusagataxux.pdfIn PDF document text
    • http://files.stbarnabaschurchcroslandmoor.org/uploads/1/3/0/7/130775310/4488145.pdfIn PDF document text
    • http://files.petethepermie.com.au/uploads/1/3/0/7/130739919/4e0b10.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/1/0435/4375/6954/files/53155601773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/saxeragam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2870/9539/files/76070173268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/87582329504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/jovogazuwese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/cz_82_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/tadona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4055/5676/files/gazuwalefosugewes.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_off00005bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 5492 bytes
SHA-256: ac0beba4dce3e46651864eed7868fab2cbe79d4c3d98accf685075b46275461e
font_01_sfnt_off00006e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7D 9896 bytes
SHA-256: 3f56c4fa1e087387a10569f9ba1a640ed3f829b3624aab55dbac67ba9ec9ee5c