Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f8ff76551a40b7…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf8a2a1a2fafb85edefc644addeea73 SHA-1: d7962be6dce05244818702045a55066deaee182a SHA-256: a9f8ff76551a40b74fec84dfb1cf1c1693a84b96b1741dae0191af1586efa7c9
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/wb?keyword=review%20of%20literature%20customer%20satisfaction%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, indicating an attempt to trick users into clicking through to malicious infrastructure.

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/wb?keyword=review%20of%20literature%20customer%20satisfaction%20pdf
    • http://kezej.dolphinrealtyhatteras.com/uploads/1/3/1/4/131453780/1494510.pdf
    • http://files.danielmarkos.com/uploads/1/3/0/7/130739906/6531940.pdf
    • http://mesanopu.clonological.com/uploads/1/3/1/6/131606289/tuzezakon_nabiriwika.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/85479820543.pdf
    • https://cdn.shopify.com/s/files/1/0437/2132/6742/files/runex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/zubutoxarafasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/dodukamirurusomesilewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/36139620148.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/36663260704.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/wewifilisabupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/wazoniz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/electronics_interview_questions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0828/4056/files/slope_stability_analysis_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/rewev.pdf
    • https://cdn.shopify.com/s/files/1/0451/2183/1065/files/45454334035.pdf
    • https://cdn.shopify.com/s/files/1/0437/8063/6821/files/diseo_de_tanques_de_almacenamiento_de_agua_potable.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/gilemijapavidavobevoluf.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_off000065d7.bin
865345152d42f6f1281c01ec72d4cb34e1778ad57abdee3e0d1b1e75d56a2ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 5460 bytes
font_01_sfnt_off00007863.bin
83b84883ccb3d52d4e3b3195643ee90b85680253f5dfe1ea19ba48d98b6be5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7863 10200 bytes

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