Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40a5f73be048a5b…

MALICIOUS

PDF

50.1 KB Created: 2020-08-23 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ab0c35c6a40e27f1f9c292e8703078 SHA-1: 4efe6161d367f065e1b08c06d5624929eb4dac36 SHA-256: b40a5f73be048a5bee064e74830cd3db81d6f4b1542e439c5beef9af4f368bb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL. The primary attack vector appears to be tricking the user into clicking the embedded malicious link, which then redirects to the 'ttraff.com' domain for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=gbf+hector+solo+guide
    • http://files.carolynscreationsminiatures.com/uploads/1/3/1/8/131856244/voloputu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/nafub.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/bsc_1st_year_maths_solution_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/joxasenulunusewekibopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/faxegivud.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/23769832625.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/file_convert_to_word_online.pdf
    • https://cdn.shopify.com/s/files/1/0465/4478/1462/files/36495973851.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/85665438834.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/xonexubixufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5276/files/91207932967.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a21.bin
9ebdf62fecc53bfc8f350ba21bf6b7eb6c0067ea5714b94c340bf58da0049b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 3280 bytes
font_01_sfnt_off000065e5.bin
22960cf891d592d359b648efdf5912b54b332079ba548397d15ca72b00238668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 5244 bytes
font_02_sfnt_off000077ad.bin
8ab923703a6cb8420f8fca7bd3ad5728ba4bd58dd88d5cf9a7680080d3c28edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AD 1908 bytes
font_03_sfnt_off000080fd.bin
5ff14e4fdfa91ea3a49169890b42be9dc892d04d2b30b4455c37f9fe20e31260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 10196 bytes
font_04_sfnt_off0000a42e.bin
b02446db7bff0d20d34db92d3b4a57b7450ac58bb5560265ff513a332289e851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA42E 16184 bytes

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