Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12e8dc600c1a4a2…

MALICIOUS

PDF

73.4 KB Created: 2020-12-14 18:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 800501a84c4394e074598d473e69b3be SHA-1: 932c15d7caaa04bda522a3ea725a2c88da6d83a2 SHA-256: c12e8dc600c1a4a26c499547686334647824866096ead033834595a990e8e159
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure related to a 'Proctor silex waffle maker manual'. The presence of numerous external links, including a link farm, suggests a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=proctor+silex+waffle+maker+26000+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5fc45db632153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5fa1ca166eb5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5fb25ed274045.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/sunuwejefowulisetom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc51cd00b6b03258f50a19d/t/5fc9a12f87b36f46d4fa26ae/1607049521142/funny_animal_pics_without_captions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54703c30a162e0c6f6b7a/t/5fd6d77ae5ac58289633d0ee/1607915391794/bomiwuzasimenokunulapimub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc1fe36a97599144e3d8f02/1606549051081/nbde_official_score_report.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f6feaf37e3b649256ad/1606373232655/formula_for_average_velocity_and_acceleration.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc791ff48c1673e559d9a4f/t/5fca5b097612084f2dbd347a/1607097097256/36434951297.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc809c8ba6c854291bdd30c/1606945225393/real_time_strategy_games_xbox_one.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50ee5bd14ff0dd2b76208/t/5fd18d435e090321caacf989/1607568708267/68223245295.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ccaa239b07229152d4e0/t/5fced802faf0bc04d1bb122e/1607391234305/kekunobexaboxif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc793749d43d906ac0e803b/t/5fd17fe1f2ee360040f07d98/1607565281845/my_talking_cat_download_apk.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5680 bytes
SHA-256: 9a2f1641284fe334b1acf350cbd020f2e796bc5b1aebfc71a2c25968d2dcf7ff
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10992 bytes
SHA-256: c0595438ed4e8a19eb9235d4f68a8ee2104cd67502c33a40258581c86569c106