Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cffdbf07c8b23e…

MALICIOUS

PDF

40.6 KB Created: 2020-10-31 03:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b4366524981331278e4d3312c72488d2 SHA-1: a766edb0d22c3d87cb32d227cd7d827d1bbc0749 SHA-256: e3cffdbf07c8b23e0d60ec4a5ea522403580eb816c47628be8005e902b43f058
154 Risk Score

Malware Insights

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

This PDF is identified as malicious due to its inclusion in a link farm and its redirection to a known malicious URL. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/wb?keyword=past%20tenses%20simple%20continuous%20perfect%20exercises%20pdf', which is flagged as a malicious redirector. The presence of numerous external PDF links suggests a tactic to artificially inflate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=past%20tenses%20simple%20continuous%20perfect%20exercises%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f8d89dca9e55.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/1/0501/0679/4138/files/66216241129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e9aa8d-29e4-4bb5-b696-d57284bb8e77/were_the_millers_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcdb931-44a0-431d-b134-1d7bedd684ae/49655703256.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/2351220708.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/brief_calculus_and_its_applications_13th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/bad_boy_mower_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/java_tutorial_for_beginners_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/arnold_education_of_a_bodybuilder.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/6327078647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/drink_a_beer_lyrics_chris_stapleton.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_off0000605c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605C 5372 bytes
SHA-256: 8514a55b949881c0583b41beb3de62485a6d7dfe120d7b7fc82d4d427666989a
font_01_sfnt_off0000728e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 10208 bytes
SHA-256: 23917562928045c0a57b9c57f2bd4497b5c2de5fd39369c0320b0405d7aab524

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