Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5200b6a5607db54…

MALICIOUS

PDF

46.5 KB Created: 2020-10-11 03:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 32c906968647d60ca4f9e1ee5cc1e2a7 SHA-1: 5e29f1104d00df177822e629361a01d21b15ad26 SHA-256: c5200b6a5607db54234e4d8801ca254df0529d37979fadd2b08cc706a3174779
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://ttraff.link/pify?keyword=streams+r+us+apk+free+download In PDF document text
    • http://fafemifuv.concordiade.com/uploads/1/3/1/3/131380485/4378793.pdfIn PDF document text
    • http://gelavubej.impartalliance.org/uploads/1/3/1/4/131407592/beduzewizoveges_tuxeganupon_vozijib_moguxijuwur.pdfIn PDF document text
    • https://site-1040177.mozfiles.com/files/1040177/1834051169.pdfIn PDF document text
    • https://site-1040341.mozfiles.com/files/1040341/keguvodavebakaf.pdfIn PDF document text
    • https://site-1036965.mozfiles.com/files/1036965/vitin.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/1/0435/4641/1162/files/some_examples_of_inferior_goods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/87015381690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/sims_3_death_flower_bridgeport.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0882/9851/files/perley_elementary_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/43889890030.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_off0000778f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 5448 bytes
SHA-256: 39a03fa0cb51edbf95b58c6a52ad2ab3670fc89b9421a07f0e33d4a308deaf98
font_01_sfnt_off00008a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0D 10524 bytes
SHA-256: 8ebfef4ad4352fada86e39d9e53a8ef991853b6d95ba98e952377d7dc7739731