Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d17f4321140ee2…

MALICIOUS

PDF

45.5 KB Created: 2020-09-12 22:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b2ccaf85578e1f7f1e882374f1280a SHA-1: d224e7c66e902ed8d750c00b1f5fdfbc33e5e945 SHA-256: 43d17f4321140ee2a50d2c20f11dbb68c9ca9830a61ad56627021ae65533e4a4
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.link/wix?keyword=instruction+manual+for+apple+ipad+4', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to an iPad manual, suggesting a lure to entice users to click the malicious link. The ML classifier strongly indicates malicious intent.

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.link/wix?keyword=instruction+manual+for+apple+ipad+4
    • https://static.usrfiles.com/ugd/4c3ae3_425e4d6318734e07b769a8dd8396e769.pdf
    • https://static.usrfiles.com/ugd/fd7405_5f4c6dd958cc4daaa8043e06a8949505.pdf
    • https://static.usrfiles.com/ugd/704f6c_758ebd6f8a694f07ae1f3578a1f99cfc.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_1dba033ed7e945b1a512099b68fd70f8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/cornell_notes_template_no_summary.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/27638517895.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/54777567808.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/wusowobexaxomuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/77822971268.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/gitex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/purus.pdf
    • https://cdn.shopify.com/s/files/1/0459/6973/5847/files/install_adb_windows_android_studio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f28.bin
0bc2187513754c209a1ff1b79f120b31e782b370bd3c40d674ca37d1cde5bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 3724 bytes
font_01_sfnt_off00006c65.bin
ffda89373a4263b7539fa9373714d73f39992d06f6b8c7594f3191bebd10c1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C65 5328 bytes
font_02_sfnt_off00007e6f.bin
5b9acf1030944cb86a5ccb345d37e17038a1cfefba64999f83afb15783752f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6F 13376 bytes

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