Malicious PDF — malware analysis report

Static analysis result for SHA-256 634188e406bfc2e9…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 03:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1793dc1b9458fb7ce3faba16aa93e931 SHA-1: 9b3638805e023ff66c1f04a26eb09d3ed831dba7 SHA-256: 634188e406bfc2e9c5f364a19ece1f811544c2fc62c5b6dd7e534e00a0374305
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary purpose is to lure users to a potentially harmful site, likely for phishing or scamming.

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.me/wix?keyword=australium+gold+paint
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/jetijuwobaravamovipiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9485/8133/files/baby_mature_speed_multiplier.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/87475173618.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/9139959823.pdf
    • https://static.usrfiles.com/ugd/6c98bc_c34d13173d16460bb7f18ef2ef59912e.pdf
    • https://static.usrfiles.com/ugd/6f58fb_963f1ee6f8a34bbc845be98432cd74e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbe9f7b9f6d4273aa45a7eb0b4c2d32.pdf
    • https://static.usrfiles.com/ugd/65b209_305c93bfb352461cad33fad1fb87674f.pdf
    • https://static.usrfiles.com/ugd/599026_5a39d7379cc44536834c691e776950e6.pdf
    • https://static.usrfiles.com/ugd/fbccce_b938d51a2611455a9ba188e9603ee453.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c386b6eac7244b1864d68e86a4d93ad.pdf
    • https://static.usrfiles.com/ugd/0c268c_aae53919bbfe42da80e72430124ca311.pdf
    • https://static.usrfiles.com/ugd/b0cd75_5adf2e666c8e47a288b9327c66725d3c.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_off00005142.bin
8ef9d78ad3194cfed994fa87d049ae54b4aa8455d584bea9e3e2bb946be9c2bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5142 5032 bytes
font_01_sfnt_off00006236.bin
80b828a3f664e1b8089ecef1d6d70d97258b07b6da93e1794b3f8fe6aa54b399
pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 10268 bytes
font_02_sfnt_off0000855b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 4324 bytes