Malicious PDF — malware analysis report

Static analysis result for SHA-256 027f71de6b60d8ef…

MALICIOUS

PDF

41.9 KB Created: 2020-08-08 19:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b370c59014ef07b5592b20419601c0bc SHA-1: aad7acbc6b4681764d3b6c81a0341a85c321abf8 SHA-256: 027f71de6b60d8ef3785d15deaa4612d154598c69a4362f658f69adc5b11d3bb
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, directing users to a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=oxford+discover+5+workbook+answers+pdf, which is likely part of a SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to potentially harmful 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://ttraff.ru/pify?keyword=oxford+discover+5+workbook+answers+pdf
    • http://files.silviareiche.com/uploads/1/3/1/1/131163683/vidiwenorewigi-biwapupupal-natufi.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/1/3/131381450/kamufud.pdf
    • http://ditosi.blacklinassociates.com/uploads/1/3/2/6/132683188/risugi.pdf
    • http://files.mymessyhome.com/uploads/1/3/1/0/131070674/7063096.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wijabogose.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/lolofifak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/aakash_aiats_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/57449764405.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/car_bill_of_sale_va.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/juegos_psicologicos_eric_berne.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/13331331290.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/89142160253.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/15219205027.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/meaning_of_hiv_aids.pdf
    • https://cdn.shopify.com/s/files/1/0438/1707/4850/files/fijenosesumusu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006483.bin
2467df8e8568c8384bab9117a61677ac830034f869613fab63fc1043f612e1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5692 bytes
font_01_sfnt_off00007817.bin
e33ce51a132bf778fd6c0da115e8e061028f53995922e6670293ef96e1defac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7817 10120 bytes

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