Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c339fe7b5041dab…

MALICIOUS

PDF

42.9 KB Created: 2020-09-19 08:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9adce93e2b0c0b06a9a0c682e89a670 SHA-1: edfdf9e30010a5271dc76a7ab86c4341771687a6 SHA-256: 5c339fe7b5041dab770c6dc7f3214415f14d31aea7bf6da887227ded53e7e0dc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to PDF files hosted on Shopify. One prominent link, however, redirects through 'ttraff.link', a known malicious redirector, to a URL containing 'realidades 2 capitulo 1a-5 practice workbook answers'. This suggests a phishing or scam attempt disguised as educational content. The ML classifier strongly supports the malicious verdict.

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.link/wix?keyword=realidades+2+capitulo+1a-5+practice+workbook+answers
    • http://files.hrcesocialstudies.ca/uploads/1/3/1/8/131856430/terovuk.pdf
    • http://veguba.jurassicvic.com/uploads/1/3/0/7/130738731/lixumakodof_muzegogipi_nanuwa_jonenav.pdf
    • http://zujuvuj.desertdolphin.com/uploads/1/3/0/7/130739963/2d89ea85a.pdf
    • http://files.parachutesforladies.com/uploads/1/3/1/6/131636655/tudavukodumefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/5443/3183/files/29990403975.pdf
    • https://cdn.shopify.com/s/files/1/0433/9784/1063/files/autoradiography_principle_and_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/lm335_temperature_sensor_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0481/1626/9209/files/steal_the_diamond_unblocked_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://17a0f10c-2ddf-40e0-8432-4407cb8f35b1.filesusr.com/ugd/90661f_5d2cb735e1a745f8a555324de7410ec4.pdf?index=true
    • https://c2da0dd1-b277-48a0-96bf-d92068737b78.filesusr.com/ugd/b222ea_40e3ce0efd3e436eac6a4da4d8f67af2.pdf?index=true
    • https://306083db-154b-4cf2-92bf-2a9e37ae90a4.filesusr.com/ugd/3f8d85_2547286b12f542e8a183230a6b8d9500.pdf?index=true
    • https://43aae9b2-4ce7-4a48-8448-434cac21beca.filesusr.com/ugd/f09a9d_d7b6ca05f08a4db2a193b8256b516d83.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/sql_database_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/76390827848.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/vovaxurerorinomakulilonum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0924/files/92956610140.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/audio_song_cutter_software.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_off0000672f.bin
6b926ec18e6dde1285acd374308cbedd38588ad05de18ec59548df726bb7d8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 5712 bytes
font_01_sfnt_off00007ad6.bin
9afcbc4be08f5bde79b08f66ddc93bcc518a682d5ae3dbd08cf782ed42c2034a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD6 10352 bytes

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