Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaec812376f61d0b…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 09:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37cf43e5242a0c0d5d3f1f48754f1749 SHA-1: 2bf6dc647eebaee13b1beb4950601101cbf4669d SHA-256: aaec812376f61d0bec76c3f854a34d1006d29750eee6b4e288fd5527b5c6217d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other URLs that appear to be part of a link farm, suggesting a phishing or redirection attempt. The primary malicious IOC is the redirector URL.

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.cc/wix?keyword=pasteur+athom%2527+s+mbuma+livre+pdf
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/entrepreneurship_theory_process_and_practice_10th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/7228832096.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/jedaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/resident_evil_final_chapter_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/nivojiwulupur.pdf
    • https://static.usrfiles.com/ugd/8e1900_b7da8753ae62480780c5f30e6a6fa4b5.pdf
    • https://static.usrfiles.com/ugd/f103bb_05c6f25a078a49348531d2394367ee7c.pdf
    • https://static.usrfiles.com/ugd/0d002d_2e8b7964978d495dbf387ffbc4ccfa5e.pdf
    • https://cdn.shopify.com/s/files/1/0461/9907/9065/files/beout_iptv_m3u_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/pudamulerewis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8542/1978/files/binary_options_winning_strategies.pdf
    • https://static.usrfiles.com/ugd/834936_47db8684455e448abb7830ca80cdec0a.pdf
    • https://static.usrfiles.com/ugd/accd1f_1874d85299544f669580114ac77421c2.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_off00004c27.bin
f13faf5695606a7f93f7b675011ef5a52ad31dea70c9acde3f358dcab4761e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C27 5516 bytes
font_01_sfnt_off00005ec4.bin
2e119520eb1d1b4cc8787b28d0d3a9b716e8a87057b82b53382c84d9d27df27a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC4 10124 bytes
font_02_sfnt_off00008196.bin
fb57b1b092696cda6b824d7f7dcb2fcaaa53a3f64ccc07fc5e91280a0b13b29b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 16104 bytes