Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9e9dbcf7f35f75…

MALICIOUS

PDF

45.0 KB Created: 2020-10-03 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c534269de1c3826814d6fff0b2f83f15 SHA-1: b00f004c63956cd82cbc801de7bf30e6feeb3c08 SHA-256: ad9e9dbcf7f35f759621a3bc1afe59726d612ac321b947949d3bb40a62d768b2
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/pify?keyword=brewmaster+monk+guide+method'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the suspicious URL.

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.club/pify?keyword=brewmaster+monk+guide+method In 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/1/0479/9525/6991/files/the_types_of_legitimate_domination.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/33_the_series_volume_1_training_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6880/7586/files/53240618991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/the_little_white_bird_barrie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/maburekibida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/58282265738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1841/9865/files/mezovokituvinofen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8729/3341/files/3d_printer_filament_cost_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3338/3071/files/how_many_calories_in_a_taco_bell_crispy_beef_taco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2296/1816/files/rilejedasolewabitixode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3086/3259/files/wipalufudajoxidexitaj.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_off0000718a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718A 5412 bytes
SHA-256: 1b643fbc1a84fbcd41ab95a4813085fba5f052229822d5f080883cfb6fbe0d90
font_01_sfnt_off000083d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D7 10356 bytes
SHA-256: 274138758c7a18d51fb544625a2890bcf87c82bf0717b1fca905180be16783dc

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