Malicious PDF — malware analysis report

Static analysis result for SHA-256 153666d0aca787cd…

MALICIOUS

PDF

54.4 KB Created: 2020-08-11 09:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ffd5bb9ab34d9fc909f1dcf4aee467 SHA-1: ef414be8893b3ddba0aaedc97c9fb72cbdb5ccbf SHA-256: 153666d0aca787cddefaa0fff657be2cef6f58bc9c66494283ec64ad15fa8235
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are part of a link farm, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a syllabus download lure. The primary malicious IOC is the redirector URL, which is likely used to host or chain to further malicious content.

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.ru/pify?keyword=wbcs+sociology+optional+syllabus+pdf+download
    • http://files.montsinaicog.org/uploads/1/3/1/3/131381614/d359901.pdf
    • http://files.tianashores.com/uploads/1/3/1/3/131384663/7416295.pdf
    • http://files.rally4rj.org/uploads/1/3/1/4/131483343/varosov-kapuxelopoz-lalufujo-lusinezefafulev.pdf
    • http://files.blacklicoriceweddings.com/uploads/1/3/1/3/131379832/funonofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/radenaxazitilavurikemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/zesiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/rafilevevamerizalibuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/xazalagatuku.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/career_test_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/4039165931.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/62142328197.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/convert_nef_to_jpeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/cobit_5_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3574/4673/files/92005938976.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007366.bin
1cd8afc489f761d0e8a54b5e4afb5714cf8988ae0bc53c01e6c95bfd2ff8e670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7366 5572 bytes
font_01_sfnt_off0000868d.bin
b8a15f705a5fdf5eacdb334652d1461e70c66a0ff3153ac18939b223a578617a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868D 10920 bytes
font_02_sfnt_off0000a841.bin
93bd91c758679947b3238b93b579b703da95c88a9f25305efe4e9012c9361bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA841 10540 bytes

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