Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7aeb56a77a6337…

MALICIOUS

PDF

43.5 KB Created: 2020-08-17 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11e8cea09e9af512a2d0b307b2b9f121 SHA-1: 85ea463fe15712571d1592b6914c0044cf2acb9b SHA-256: 3d7aeb56a77a633795785d078cfc6f46c248bbff23b07d2eef1fbf2959f54a5f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.ru/pify?keyword=aws+availability+zone+cloudformation' is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links to PDF files hosted on Shopify and other domains, suggesting a large-scale SEO manipulation or content distribution scheme. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=aws+availability+zone+cloudformation
    • http://zexefawim.tiggersmainecoon.com/uploads/1/3/1/4/131406821/8534033.pdf
    • http://files.robciccotelli.com/uploads/1/3/0/7/130775017/pefid.pdf
    • http://files.imagesbyk.com/uploads/1/3/1/4/131455198/telademubakedijezik.pdf
    • http://balirova.wildoncherrysalon.com/uploads/1/3/1/8/131856124/xusakefi-bituvadom.pdf
    • http://files.kerrybeckerconcrete.com/uploads/1/3/1/6/131607374/xivapigutenijekapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/90393136569.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/47933552679.pdf
    • https://cdn.shopify.com/s/files/1/0437/0232/1307/files/32200382538.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6839/files/college_board_psat_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/80209926277.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/tijidatemezideporedinad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/magarelagosan.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/92467916172.pdf
    • https://cdn.shopify.com/s/files/1/0430/8828/1761/files/adaptive_launcher_icon_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/58562081662.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_off00005f96.bin
346dab47e818fb38b4a0a8cb241b2cb5e9caa1263f42935e71c7df8575ad0fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F96 5600 bytes
font_01_sfnt_off000072a1.bin
d69d9caa28054d39fc507e1e80ed6606365fa1c03a83bc7fe0ff484cba489f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 14904 bytes

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