Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4b67c894cb6ca3…

MALICIOUS

PDF

36.5 KB Created: 2020-08-14 13:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f8f64641442cdfa747abc6a994c52c28 SHA-1: 271d142378cbe231428b73487bf5e4829d1817e5 SHA-256: ae4b67c894cb6ca345fee5868856da9241d46c423527e4d241701508f4c1c301
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=bely+y+beto+mcallen+performing+arts+center'. Additionally, it features a PDF link farm with numerous external links, including one to a Shopify domain. The ML classifier strongly indicated maliciousness, and the embedded URL in the document body reinforces the redirection attempt.

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://ttraff.ru/pify?keyword=bely+y+beto+mcallen+performing+arts+center In PDF document text
    • http://files.ironmenfootball.com/uploads/1/3/2/7/132712139/zaxatibawijidag.pdfIn PDF document text
    • http://files.kaiderlaw.com/uploads/1/3/1/4/131409385/mexigofefagaxi-zugaginava-mefilo-zobodirotulala.pdfIn PDF document text
    • http://files.coachrickdarlington.com/uploads/1/3/1/1/131164100/7464226.pdfIn PDF document text
    • http://pajozara.marcusesmith.net/uploads/1/3/2/6/132681352/sajuwemaz.pdfIn PDF document text
    • http://files.orchardfarmandcottages.co.uk/uploads/1/3/2/6/132682022/jusipilovewu.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/1/0438/4201/1293/files/algorithms_4th_edition_4th_edition_by_robert_sedgewick.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/dufanozerudejubebike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7954/8574/files/business_administration_and_finance_burlington_books_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/numuxetobivulosimusodojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7301/9797/files/eicr_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/pudumogukekotifokolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/8368/2212/files/ccnp_r_s_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/sop_97_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/norton_field_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/22577996067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82505274200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/saxoguvidafanonowevekoxe.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_off00004e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E94 5624 bytes
SHA-256: bc7a54719cca6c81f39f2bae3af7ce9ac68cffb0028fef28f7c1f23f35d2af68
font_01_sfnt_off000061ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 10396 bytes
SHA-256: a1de190ccc880e18fd064cf5c235806feb18f2c297398f729bc386d095a9c746

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