Malicious PDF — malware analysis report

Static analysis result for SHA-256 518eb841d148bc4e…

MALICIOUS

PDF

48.7 KB Created: 2020-08-31 10:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3c7bc08cd458fddcbb9b4e1b110312 SHA-1: dbdd6333730a8cf2c32bb948f65045f64271e45f SHA-256: 518eb841d148bc4e07f9b501829a29d83c7a6fcbf427b5b4c4a28dd0c0abe15b
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), while another noted a large PDF link farm, with many links pointing to Shopify domains. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=breath+of+fire+3+bunyan, suggesting a lure to a potentially malicious site.

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.com/wix?keyword=breath+of+fire+3+bunyan
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/19905400796.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/86692156751.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/bagunenobugefanawe.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/asnt_snt_tc_1a_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/34788514584.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/75504443584.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/gym_bodybuilding_workout.pdf
    • https://static.usrfiles.com/ugd/850f07_e9b04266b04544e7b6dd4be3bba55e1d.pdf
    • https://static.usrfiles.com/ugd/516793_5eb68a1454424e058f16285d88f8e0b9.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_09fc7e1af0154c23875f717a7db23710.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1537bbddb36496ba8d58b19bf8e11e4.pdf
    • https://static.usrfiles.com/ugd/d1c05f_c31dd16341da4c0b8853ca4ce4f6f53e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/87806030199.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2791/files/eudora_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4583/files/69007411253.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7913659608.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007417.bin
4ec8656f74fad00e29aa8ccaeba8dda61fb2fdf7019a8bf186d6e2170e024fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 3320 bytes
font_01_sfnt_off00007fcf.bin
1ef3e71532353f59b3d4888572b0d4104446c80221220c2974e352e18b2f7e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCF 5100 bytes
font_02_sfnt_off0000912d.bin
194cf12205e2a5fd77e1641cebe782368eaac19e8134189b4bab4f0f83bd84a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x912D 10132 bytes

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