Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c82b6ff114bc40…

MALICIOUS

PDF

46.8 KB Created: 2020-08-07 12:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef52ab519cb27c865ad663155e48569f SHA-1: cf2f5ab05d268ce0c9cf65c4513aec014d7a5945 SHA-256: b6c82b6ff114bc40f9115479fc5fa746acefb963309a4dd03cf681d1d210e5ec
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting an attempt to disguise malicious redirection as educational material. The ML classifier strongly flagged this PDF as malicious, supporting the presence of 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.cc/pify?keyword=class+10+chemistry+chapter+3+notes+pdf+download
    • http://files.azamericansaddlebredfoundation.org/uploads/1/3/1/4/131437865/c22849b7e4a4b.pdf
    • http://files.artisanhomebrew.org/uploads/1/3/0/7/130775633/9486914.pdf
    • http://files.johnsclassiclures.com/uploads/1/3/2/7/132712323/893646.pdf
    • http://vuzegif.insomniacstudios.net/uploads/1/3/0/8/130814575/rexujekazapa-zirogexivex-rujelalowikad-mipumupukaji.pdf
    • http://files.escapetothesalon.com/uploads/1/3/1/1/131164124/masokupuwut.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/certificat_de_cession_de_vhicule_3_exemplaires.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0683/files/tiwawegexawusev.pdf
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/43713406423.pdf
    • https://cdn.shopify.com/s/files/1/0432/6935/7728/files/colorectal_cancer_epidemiology_risk_factors_and_protective_factors.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/89429304496.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/john_deer_935.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/kofuvimovemoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/37275024077.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/converter_to_word_download_free_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/gagodufure.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/3155881881.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/fojukoguga.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_off0000688f.bin
9612076824e0b1d0583f50420d68611ce9b51b2657fd6c36368a5bf304c54d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 5756 bytes
font_01_sfnt_off00007c18.bin
8efeac6ae3f133eaf44cb4abf98298d44cf8b26dda3eb9f43f2b7c71d9dca815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C18 9936 bytes
font_02_sfnt_off00009dd0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD0 4324 bytes

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