Malicious PDF — malware analysis report

Static analysis result for SHA-256 1113f2c6cafe1eda…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 20:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 179763eacf5b0863f1c18c628b1ac876 SHA-1: cda666a09d69fd129fcce7054f6fe016a2e1b594 SHA-256: 1113f2c6cafe1eda4392e4de24e1b7c53b3ac7a75b62ec43b9d5a5d6f3020515
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Turnitin similarity report time' and includes the malicious URL, suggesting a phishing or scam attempt. 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=turnitin+similarity+report+time
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_2c72a0f8ab2940409ed741619c74f9ba.pdf
    • https://static.usrfiles.com/ugd/430cb2_d20558d770b74ef492d35de863fcf90c.pdf
    • https://static.usrfiles.com/ugd/cafc24_c097f76c7e994825a3c50a98c4db5ac0.pdf
    • https://static.usrfiles.com/ugd/2c608b_0c9b3233032f4e8fa4db6d123e4a3d4d.pdf
    • https://static.usrfiles.com/ugd/902d29_cec29166eda54e39a691274840555cda.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/link64_video_er_ultimate_standard_1.pdf
    • https://static.usrfiles.com/ugd/26481d_a30cad67d1434a7893a150c452db3a82.pdf
    • https://static.usrfiles.com/ugd/4117a9_1e14d7822a2344258b60862d3252ec8d.pdf
    • https://static.usrfiles.com/ugd/08fe48_13cef71ef30b4120b985e7988fa42d4a.pdf
    • https://static.usrfiles.com/ugd/10b11f_2d3d5fba494a40abbd00ec25b5309447.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa44afc193894e7a97ae48abbf4235e1.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/clear_apt_cache.pdf
    • https://cdn.shopify.com/s/files/1/0440/8023/4661/files/b._p._lathi_download.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_off00006b57.bin
5a2141cad7f364a0006f5edcde9ba974756fb664a02d299211c1dbe187a3f876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B57 5016 bytes
font_01_sfnt_off00007c54.bin
2b61ed29dd0526b865d912fa20eedab11ca9761e2fb3f9cd61cdbc403a08be7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C54 10228 bytes

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