Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99c5f48c3009b01…

MALICIOUS

PDF

34.4 KB Created: 2020-08-19 15:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3753c20ae02e951d434b8bbeac563ce2 SHA-1: d1c00ce47f72d83da174655a0f651d9a4a72a3c1 SHA-256: d99c5f48c3009b01b20a77d912cc51b857ff0dbfb5d5290644345c1d9cc45e99
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm pointing to a malicious redirector. The primary malicious URL is 'https://ttraff.ru/pify?keyword=touch+blocker+apk'. While the document body is heavily obfuscated, the presence of numerous links, including one to a potentially malicious redirector, strongly suggests a phishing or redirection attack. The ML classifier also flagged this PDF with high confidence.

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=touch+blocker+apk
    • http://files.jodymorse.com/uploads/1/3/1/6/131606431/vufamakalozezan.pdf
    • http://togewere.insightamerica4u.com/uploads/1/3/0/8/130814241/zabezob.pdf
    • http://files.hairbypearl.com/uploads/1/3/2/7/132712000/98b40b7.pdf
    • https://cdn.shopify.com/s/files/1/0449/1975/0811/files/raladetonajobajewali.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/78574980774.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/ctet_answer_key_paper_1_set_l.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/87424377836.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/types_of_active_learning_methods.pdf
    • https://cdn.shopify.com/s/files/1/0448/4559/6834/files/80325763438.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/ssrs_report_blank_page.pdf
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/22868462827.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/45161616657.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/towuvewuxesinelelanetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/zuludaxeparoremamej.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0637/files/rijafakagabid.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3895/files/elements_of_news_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/jean_michel_jarre_music_sheet.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_off00004a35.bin
b7c1a5120bb5c4d161464cc824aecd013f56374d1738042dd1986dc13a2d1baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A35 4996 bytes
font_01_sfnt_off00005b2a.bin
9ad63ac4cf2d72a7f95755cbdc3a718fe980450626f0939f4687a2b8aaad0f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2A 9884 bytes

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