Malicious PDF — malware analysis report

Static analysis result for SHA-256 f921f67eee7ed053…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 11:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d532ece57ac8cbce6069a9e4a566363 SHA-1: 40821c91f6e0b9d0b62fff1d16389244f4527b99 SHA-256: f921f67eee7ed05387964ae1582402b77817870a3bb473145fb47cd5769da7fd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains text related to a scavenger hunt template and includes the malicious URL. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or content-loading strategy. The ML classifier also strongly flagged this PDF as malicious.

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=bachelorette+scavenger+hunt+template+editable
    • http://napig.tinezrootsclub.com/uploads/1/3/1/4/131408027/3145091.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/ashoka_tree_leaves_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/cyrano_de_bergerac_online.pdf
    • https://cdn.shopify.com/s/files/1/0457/6709/8534/files/new_silent_song_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/8579/1393/files/72620008068.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/91762617742.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/30_rock_pilot.pdf
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/carpal_tunnel_syndrome_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/zeninesezagatovexovolax.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/camino_island_john_grisham.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1477/files/amortization_schedule_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9924/3174/files/blockbuster_video_song_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/beginning_apache_hadoop_administration_download.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_off00006377.bin
da0ecc99e7dd31a2a7a95efaf640f96bd876e89ae5ce695dd6ec39fc86a9f250
pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 5736 bytes
font_01_sfnt_off000076c9.bin
90838dbb8a7eb9633a45da0ef7c3cdacd6fc2adf8446725e5ff421899cae6a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 10736 bytes