Malicious PDF — malware analysis report

Static analysis result for SHA-256 675b194a4e1b5122…

MALICIOUS

PDF

43.9 KB Created: 2020-08-23 13:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ddce2bec3451059eaba12a7e4ee0b85 SHA-1: c69df21ddb7a31855b651955f7db4ab50b9629e2 SHA-256: 675b194a4e1b5122a90375e91ef9c8ecd0f12a0e7f579200a3c9551b9731a38f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or lure users to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards malicious intent, likely related to phishing or malware distribution.

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/pify?keyword=fundamental+counting+principle+and+probability+worksheet
    • http://files.irayastudycenter.com/uploads/1/3/1/3/131381374/294a17b.pdf
    • http://zejuruper.divinelightandguidance.com/uploads/1/3/2/7/132712323/refubinoledupawis.pdf
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/piecewise_functions_domain_and_range_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/dasusuwekig.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/26369234237.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/4166223174.pdf
    • https://cdn.shopify.com/s/files/1/0435/3107/5743/files/dimavoxitemipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/77390895271.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/9488590010.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/jogon.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/pubukuju.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/befirusepozowuxuvodupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5070/3779/files/10th_grade_world_history_workbook_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5d.bin
eeeee696af081cbb683839b3a7f185210e37ffa62f227e394660f450d2c8321a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5D 5720 bytes
font_01_sfnt_off000071b0.bin
058a06ab3d21bb5ab36db7702b7f077d675eb19ba6f98ac715015871141a2147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 10064 bytes
font_02_sfnt_off000093d4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D4 4324 bytes

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