Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26ba619b30fa00a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 19:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d44cb45f0af195fe39ad4d674374ae SHA-1: ed0284a7548876449ab32a17b5b9edc31db349d7 SHA-256: a26ba619b30fa00ac74df05a9b9dbcaa1231a924e8ea01bb3f33dddf0801e097
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link within the document.

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/wix?keyword=2+caracteristicas+del+conocimiento+intuitivo
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/leappad_connect_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/12_utc_to_cst.pdf
    • https://cdn.shopify.com/s/files/1/0432/8046/6080/files/livezinusoronezizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8783/8886/files/loxomevitajit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/24438108999.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5031/files/charlie_chaplin_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/74915527972.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed11edce889742b6ad23190d87bdaf6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec6339463554b088c11928945fb956a.pdf
    • https://static.usrfiles.com/ugd/eb4c03_c99a4cff94a8460b8a0391dc36616223.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b8b50b6c65d44b3a894d9dbbbea10e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_09a96ab70c8642eca0de305974aaf86d.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006700.bin
d1fdb23e442bbae6dc630185c2667d83ccc91f6e1bd5480d5aec2c761873c358
pdf-font-stream PDF embedded font (sfnt) at offset 0x6700 5184 bytes
font_01_sfnt_off0000787d.bin
da471559ee018ac94094bea70db9453217979c0d2a0562c3d949bcab2001572d
pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 11360 bytes