Malicious PDF — malware analysis report

Static analysis result for SHA-256 509826c0923d10da…

MALICIOUS

PDF

38.9 KB Created: 2020-08-19 04:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f947e653c1beaca1e93fbc6f5e982d5d SHA-1: 4398c5fba941ab89330a2555b9f9f08ccce9269a SHA-256: 509826c0923d10dabe195884d13d6f6fcaf8c8dea9b445fc169fa255dcf666ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and a search query, suggesting a lure for users to click the link. No scripts were extracted, but the primary attack vector appears to be redirection to a malicious site.

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=flashlight+jessie+j+sheet+music+piano
    • http://rajin.heatherwittmezzo.com/uploads/1/3/2/6/132683001/521d87500.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/46461976977.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/20613682275.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/xejeludaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/writing_equations_of_parallel_lines_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/88467278761.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/90035996231.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/habitos_alimentarios_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/woxefusunazumumifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/calistenia_workout.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/28828977986.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/58851154663.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/gestin_de_calidad_total_metodologa_y_herramientas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fupibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0440/4579/5493/files/group_isomorphism_theorems.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_off00004e84.bin
4ff71fc9c106326985a1fbfed35bb59a288369008928283dc9021accc59ba2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E84 5280 bytes
font_01_sfnt_off00006063.bin
e95370771d4cc175d81763e0c8538472266f58c0d503d55a7f73e9bb89eccecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 14836 bytes

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