Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d1bbe70796924…

MALICIOUS

PDF

50.3 KB Created: 2020-09-06 02:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82575d0629d216477746cce66fb1a15 SHA-1: fc7197c97305a362b671cce852222f480a66f23f SHA-256: 144d1bbe707969248108cd3d9e512aba4b4f25efd7ced6fa10f167c0c4a3b9a1
154 Risk Score

Malware Insights

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

The PDF document contains a link disguised as HIPAA security guidelines, which redirects to a malicious URL. The presence of a large number of external PDF links suggests a link farm used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicates maliciousness.

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=hipaa+security+rule+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e1d58f_086ab94aab8e41a0bfafda27b4e7dcf9.pdf
    • https://static.usrfiles.com/ugd/4f92c1_8025a8d7b91b44bdb2273ade812d7af4.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd478a87a217432d8bf1dbebc761b52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3743659eb6c8433fa757ec478e5318f0.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_f131d8ad314d4da78a66480e2350f4f3.pdf
    • https://static.usrfiles.com/ugd/902d29_8241e39c06ab4106ae49d7329179c48b.pdf
    • https://static.usrfiles.com/ugd/b8c837_590ecfa9c212456080d2cc9d8e5beffb.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb33a94129224f33a0713f8beccb0603.pdf
    • https://static.usrfiles.com/ugd/a374b9_2a31876ace474c678065d92f3e79c652.pdf
    • https://cdn.shopify.com/s/files/1/0452/5257/5394/files/criminal_law_books_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1125/1099/files/page_break_in_using_php.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/introduction_to_mastering_physics_answers.pdf
    • https://static.usrfiles.com/ugd/429b25_e544e1080c1b48adb78728bb432492b9.pdf
    • https://static.usrfiles.com/ugd/e481ce_71591cf21f70475ebd25dae1c58dedae.pdf
    • https://static.usrfiles.com/ugd/30e015_b7d8be2a387f4b16989b06c2ed86e2bd.pdf
    • https://static.usrfiles.com/ugd/2d797c_157236fe87d449898ce141f642c6562e.pdf
    • https://static.usrfiles.com/ugd/23924c_e5c7332a30ac47eb82cde7dd1800141c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000862a.bin
e8f21330ed05c84a252d904a6546bfd38593e35553fbeede6023d0800be395e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862A 5304 bytes
font_01_sfnt_off00009846.bin
88ff7d15057472f5debb2ef9a2bcb79cb2024fcfe10c8d02ee5696401423f80d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9846 10688 bytes

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