Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd7906e2e04f67…

MALICIOUS

PDF

47.7 KB Created: 2020-10-06 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ce673825c64c9046b4c0308cefe9c011 SHA-1: dd9d4667871dbe8cf40d68d37db50fc7d089f58e SHA-256: 23dd7906e2e04f67842d7aa7cf748be59b6a3f22b52624656bc062e907a4a16c
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The primary attack pattern involves luring the user to click these links, likely leading to further malicious content or exploits.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gettraff.ru/strik?keyword=canciones+catolicas+letras+y+acordes In PDF document text
    • http://kuxebagur.canadianhomeandschoolfederation.ca/uploads/1/3/0/7/130776167/f21f59f0ef7a.pdfIn PDF document text
    • http://files.thesilentbeauty.net/uploads/1/3/1/4/131436991/dadew.pdfIn PDF document text
    • http://files.linlinkyawhtet.com/uploads/1/3/1/3/131380397/fc8c6b77.pdfIn PDF document text
    • http://rewifosix.manzanitasplayschools.org/uploads/1/3/0/8/130874063/6024054.pdfIn PDF document text
    • http://files.therealequestrian.com/uploads/1/3/0/8/130814423/5758bfbf5.pdfIn PDF document text
    • http://mobir.royaloakptacouncil.com/uploads/1/3/0/7/130775726/117345.pdfIn PDF document text
    • http://files.landonpowellhithouse.com/uploads/1/3/1/4/131453990/9886278.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/1/0429/2512/9891/files/golf_swing_plane_trainer_circle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/volulotavoverawuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8360/0550/files/my_hero_academia_season_1_episode_6_tagalog_dub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1229/8648/files/la_fitness_glendora_opening_date.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/rutgers_summer_session_add_drop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/suxesozemozibezumudanip.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_off00007a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 4940 bytes
SHA-256: bb02a6afbb0cfc1db9afa0980ba4bfa0cd22f08989ce503132eb60c1bc1bf32f
font_01_sfnt_off00008b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B31 11320 bytes
SHA-256: 565539d3bb480ced4a99fefa97c5da309e8d9b17861535c25c4eeb0fab61bfde

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