Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e61c8e032f1e4…

MALICIOUS

PDF

42.0 KB Created: 2020-09-04 23:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 848775d612305d8f9dd2fd7774666a01 SHA-1: f09d08b451c89b16a2505590ba98084e90f596ea SHA-256: 857e61c8e032f1e492c975bd66824a00e80138c3a445ef3ccc163db88993b8cb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure related to the game 'bloody roar 4' and embeds multiple links, including one to a known malicious redirector. The ML classifier strongly indicated maliciousness. The embedded links suggest an attempt to direct users to malicious infrastructure for phishing or malware distribution.

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.club/wix?keyword=game+bloody+roar+4 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/96a426_2e99875e3f3b43a9bdb6566039851bf4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/44b221_d15a0a24d5e341c5b3ab1fa251099bbe.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3d7af5_fe860d8c95b446d1925b4278d5a8349b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/64068716162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/wanting_memories_sheet_music.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/77eba6_f6210814159c4c26aff6049afb705b90.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b97dd_99aea75b8ce44b67b1f3d5dc70c5346f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/be19e1_c705dcf406c64d01abf09dc4d7132ccc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7202/8833/files/75490835150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1846/7997/files/porigakuzugaderewuviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/negeruk.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55B8 6832 bytes
SHA-256: 01ac34376b7092400a12f9c5b46029046d686b565a1181b560d79e3eb0283013
font_01_sfnt_off00006708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6708 5156 bytes
SHA-256: d11ce4ee20907bde73517d93530ceff66082a93ec62ab93717a640a9d066d008
font_02_sfnt_off00007887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 10244 bytes
SHA-256: 06fc94b380397f344dd5e0cd137e84d2646435368b59f6b9487f287cd2338ca3

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