Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e8ef341578e715…

MALICIOUS

PDF

49.4 KB Created: 2020-08-05 11:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e205837aa907072e4d1b3cacba7bfd1c SHA-1: 01bbcea01a21e09bd42248c76cf7d86845cf39ee SHA-256: 75e8ef341578e71548458cb2c17cbfdeb003dae18e2972f6981443d8c9e27d1f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=renal+dialysis+procedure+pdf. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/pify?keyword=renal+dialysis+procedure+pdf
    • http://files.birchfieldpractice.co.uk/uploads/1/3/1/4/131455463/jojulixerigiwag.pdf
    • http://files.yoloinbiology.com/uploads/1/3/0/8/130814588/532568fdad.pdf
    • http://files.arsenicofjabir.com/uploads/1/3/1/4/131406274/nokobexusokabok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/football_world_cup_2020_fixtures_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4359/files/cultivation_of_cocoyam.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7808/files/2184578217.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/44870681636.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/voverowagimemudepitad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/learn_french_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/48893036988.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/botoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/6558643806.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075c3.bin
4e5c7c47cf6731abb6deb62cdbc03d0c4dbdb2d7f30046c04b44246bb8dd790c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 5060 bytes
font_01_sfnt_off00008705.bin
84e50b28373f01e5e48fe67705ee8de41dc6e37f7583b204e5cce2c021a211f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8705 10432 bytes
font_02_sfnt_off0000aab9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB9 4324 bytes

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