Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfd0daa7d7659d8…

MALICIOUS

PDF

50.5 KB Created: 2020-09-01 06:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e4af4ced5f6892b359a80ed1bd18527b SHA-1: b4882c5dbe8a6d7b0bce54260f07c7fcd7496618 SHA-256: 8bfd0daa7d7659d8c1d326b985226701ecc2dcaab6f5c89e092af61f141c6ac8
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.link/pify?keyword=butterball+electric+turkey+fryer+cooking+manual In 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/1/0436/5543/0302/files/ritama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6302/3518/files/xuwopavumejiveriv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5052/4823/files/mewuwatujijam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6335/2227/files/acofas_vk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/bubisabevuzudalowawebaji.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_175e6168f65b4591b5f64085f489e4f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4826f5_8a90546ad32e47b2820c53b4c2721b53.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c714e32458084232bcc2e16704a0d60e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e74b192ddd1b4f3e8f1d9e7986e3cbf2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1987/7024/files/dilation_and_similarity_worksheet_1_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/24888456246.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/34776135126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/71939329528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/canal_atrioventricular_completo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/43960912192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/sec_to_days.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_off00007f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7B 5380 bytes
SHA-256: a73afbc354d6c9c32d52ef34dc08927e0531475fbf655b542d3708da01ff439d
font_01_sfnt_off000091cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CD 13436 bytes
SHA-256: d0e5d3060d1e75f0a00da13bd0148e829296b8eb5d855bcc0cf1619d559dcc6e

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