Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66852e351192f86…

MALICIOUS

PDF

50.5 KB Created: 2020-08-26 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3245fb28d27485f4a2e87a85cddf20d9 SHA-1: 82ffd1785d3b69edaabc94738de1c5043f887c4b SHA-256: c66852e351192f86e389fe86483e7316f0730dbca3fbf83f7af2825eb68ba430
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector (ttraff.ru). The document body, though obfuscated, also contains this URL, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links, many pointing to potentially malicious or unknown domains, further supports a malicious intent, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=license+plate+template+texas
    • http://files.prime-runner.com/uploads/1/3/0/7/130738499/gigiwi-bimodufusis-venuzadenetunex.pdf
    • http://files.tomasosinski.com/uploads/1/3/1/4/131437246/80a374c93.pdf
    • http://sozalogi.mho-thevenue.com/uploads/1/3/1/6/131637316/721469.pdf
    • http://files.olibot.com/uploads/1/3/2/7/132712251/ripigumuv.pdf
    • http://files.onsighteyecare.co.uk/uploads/1/3/0/7/130739287/fafubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/classroom_assessment_for_student_learning_stiggins.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/13391332822.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/lowes_colerain_ave.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/bipiwijelutimuwosafim.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/35179108103.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/41944455316.pdf
    • https://cdn.shopify.com/s/files/1/0434/5430/0327/files/betiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/7190475670.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d0c.bin
736e9f88131b6f2baf56e984c6663b5b7d847f0a229edc14a954fa525dbc4878
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0C 4992 bytes
font_01_sfnt_off00008df2.bin
7fba1d59a9ecf55d79f00df3e2ba818d914ab7c4fe49545b37f8ab1585078fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF2 14268 bytes