Malicious PDF — malware analysis report

Static analysis result for SHA-256 153b41a8686bbf3c…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 19:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84ae1ade252d095024c3d43302b5714f SHA-1: 5b041abebc95c413805b05035c16854848df394e SHA-256: 153b41a8686bbf3c9c4b6d07afe34d180743dbc94a1b92e7b4878328b53e6aff
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'powershell_move_file.pdf' and a malicious URL, suggesting an attempt to trick users into visiting harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=anatomic+dead+space
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/15cd4d_9d0e408ecd9d4aca87055baf088568fb.pdf
    • https://static.usrfiles.com/ugd/4479ed_b75a7cf57b804302b8cf5af0eb16ea14.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/0a0016_bb6a1e6fd0cd441d9c45416be1e0f841.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_94ab54b4a526411bae74c451d2b1c6d4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/full_form_of_all_network_protocols.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/66576007728.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/80067117006.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/powershell_move_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/dark_heresy_game_master_s_kit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/mlsu_online_admission_form_2019-_20.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/62279217930.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/97331316577.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/animals_name_in_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/bailey_bridge_components.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/
    • https://cdn.shopify.com/s/files/1/0
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7a.bin
d2f619c73469b02df675059e3db855b1ea408a7a2b88f3231f677c6f4b09551c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 5080 bytes
font_01_sfnt_off00007fa9.bin
6c3fcc97413031dd13337003f65f25d0566a81ddba9dc8469ee3b8cd4c78a7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 10776 bytes

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