Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5549f61c2a9ed4b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 13:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dbc98bc0fc24a2f513311c9484281fa SHA-1: 9fa658a1bb9e098f1bb9c7d4a35a9c374fc718de SHA-256: b5549f61c2a9ed4b7f966979ee9fee70bd2bd0a3e7dcb82ac545cd6bd2815b28
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=geometric+sequence+worksheet+with+answer', is identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'geometric sequence worksheet with answer', suggesting a lure to disguise the malicious intent. The presence of numerous links and the identified malicious redirector indicate a link farm or redirection attack.

Heuristics 3

  • 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.
  • 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=geometric+sequence+worksheet+with+answer
    • http://files.anthonybosman.com/uploads/1/3/0/8/130873718/sozutisiwulufeledusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/zadinovorovazutinawiliza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4546/1909/files/minecraft_beta_1._7._3_texture_packs.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/anti_terrorism_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/classification_of_toxicants.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/59866769691.pdf
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/52501097219.pdf
    • https://cdn.shopify.com/s/files/1/0437/7251/0362/files/c_programming_algorithms_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/51128924466.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/20016143693.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/90666086845.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/letter_alphabet_tracing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/elementary_statistics_solutions_manual.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_off000060b5.bin
1031f7a054e6cefc95910294adfa84e088dc75030d26941ea5d5814ace30d76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 5320 bytes
font_01_sfnt_off000072bc.bin
5b67c96f4f819c1310767e9d2d39311cf6acb40cc7b1ad224ba86f9b4eb9c55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 14672 bytes

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