Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c552179bab6871e…

MALICIOUS

PDF

40.7 KB Created: 2020-09-03 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 198c252cb0d5ac61f6cf33fd11b825d6 SHA-1: f1a60427a9071119db918aa09d17efe3ed6616c8 SHA-256: 7c552179bab6871e4447f91c42edbe9a8b1a236b0eb3800d1449479f007ac766
234 Risk Score

Malware Insights

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

The PDF document contains embedded links that point to a redirector URL, which is a common tactic for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Katyusha classical guitar sheet music' and the redirector URL, suggesting a lure to trick users into clicking. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics further supports this. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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.
  • PHP webshell / backdoor source high WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (request input fed to a command/code-exec sink). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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.ru/wix?keyword=katyusha+classical+guitar+sheet+music 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/76de1a_229e5a2a4a9b46279861c97eda40606a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/06497e_533d091b2c4b40388efe969c3a1acc08.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9d66c7_d54383ee39bf4c418d351b28bc80dac4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3cb679_22f62e527d5e4fc58e5602b835d23de9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_59b09932d81247ee9886183dbe279cfc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cdb50c_e1f047d425784f039c5d9c1e4a186bc9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ed537_a75e1408a3d14d08a35b7a00e62989a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2b3f46_d3a89249ec954bd29cc4b49e4e2bea4d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/bomomikivinalubokisamegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/zalowajujinulofowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/federal_arbitration_act.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7282/9078/files/balupu_movie_audio_songs_naa_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3747/6252/files/aeroplane_clipart_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/visit_http_www.adobe.com_go.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/6728421675.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5432 5284 bytes
SHA-256: dd5f541000b802da1108169b3a154666c42443820abe8a60e621723772ac440f
font_01_sfnt_off00006612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 14552 bytes
SHA-256: 08a8c3fbe9d3c279ddff14fa0028b03f8e1e2ae90ee200608b97fec73fbad725

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