Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd88a157a3566865…

MALICIOUS

PDF

44.9 KB Created: 2020-10-07 10:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 897e40138f41e3528c9418e9e7180481 SHA-1: 7d55b111151eeaddd30bfe4c9f46fabe236a985e SHA-256: cd88a157a356686504ed43625ef62116df11de9532c904d1090ada1b3e81f411
234 Risk Score

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.
  • 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.
  • 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/pify?keyword=fax+machine+walmart+canada In PDF document text
    • http://files.adam-may.co.uk/uploads/1/3/1/3/131383541/34e9b0.pdfIn PDF document text
    • http://files.servicesveterinairesambulatoireequin.com/uploads/1/3/0/7/130775878/de5be0.pdfIn PDF document text
    • http://files.muslimgirlsfence.org/uploads/1/3/1/4/131437941/8055203.pdfIn PDF document text
    • http://rimolesu.countryblastradio.com/uploads/1/3/1/4/131454143/lukilovis-jotulinu.pdfIn PDF document text
    • http://mafinon.transactionbankingacademy.com/uploads/1/3/1/4/131483152/8ce7755c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/matlab_for_engineers_moore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/finish_the_baby_rhyme_free_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7967/3019/files/the_maze_runner_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6648/5655/files/william_and_mary_law_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7827/8550/files/red_scarf_girl_chapter_15_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c079e27-555c-4613-917a-04888b135b45/77440509665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32de9908-ed05-41dd-82ff-9dd3a6e70853/rizivadutilavebiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a4a813-e16e-494a-af2a-8dd8130fa5dd/zupidegevedoxupularobadej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B9 4796 bytes
SHA-256: f636aba67a9f2529124cb0f16bfed578aa20ff0c09b105abc213097275d51b2f
font_01_sfnt_off000075e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E2 10120 bytes
SHA-256: 2132aead730c7ec2e466fb1beaedb6833413cb3d28e3b5e6ece1a9dc6d136472
font_02_sfnt_off00009895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9895 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34