Malicious PDF — malware analysis report

Static analysis result for SHA-256 23679c7305c704a8…

MALICIOUS

PDF

60.6 KB Created: 2020-08-12 16:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 985cabb9379a6c10d2ef5aea3a862e39 SHA-1: d9e7ac1a868ba0af4c8193530492430fdf101684 SHA-256: 23679c7305c704a8fbfa685dd3684988c227a9e03b64e3ac5f04bcea22a5d90e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a textbook download. The link leads to 'ttraff.cc', which is known for redirecting to malicious sites. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=ap+biology+textbook+campbell+11th+edition+pdf
    • http://files.kathrynyancey.com/uploads/1/3/1/0/131070212/9c4901.pdf
    • http://kibuzune.clsportswear.com/uploads/1/3/0/9/130969130/detume_jodonusofa.pdf
    • http://files.ndsubisonrobotics.org/uploads/1/3/0/7/130776388/wojuzopukesuboxolup.pdf
    • http://xigoreg.rintheyordle.com/uploads/1/3/1/0/131070420/xexomuputakuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/41581340155.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/barefoot_in_the_park_full_script_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/mozemalonegikizuwokitok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/36832468109.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/14688149271.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/fobiwasurow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9787/4851/files/surface_area_of_prisms_and_cylinders_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/zimbabwe_10_point_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/xajogojez.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/5455681324.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/anton_lavey_books.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_off0000af93.bin
f35b4371ac74849444aaed238f39c844e884ee835540ec0f876a309740e8c862		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 5712 bytes
font_01_sfnt_off0000c2eb.bin
104c0b2e92c7e6a5d09f4dfc0e1a6921c81f4198e7068aaebe26eff63a082a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 9864 bytes

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