Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bafaa365260087…

MALICIOUS

PDF

64.7 KB Created: 2020-08-12 09:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acba19160a13bd9c499c4841b0c0567a SHA-1: d724bca2be49d12f84b6ef04ea63a625dcdd2d20 SHA-256: d5bafaa365260087b24229f7e646359414254796b1685dc68953bbdacdfea88e
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary payload delivery mechanism. The document body text, though garbled, contains the phrase 'rapidex english speaking course pdf file', suggesting a lure for users seeking educational materials. No scripts were extracted from this sample.

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=rapidex+english+speaking+course+pdf+file
    • http://files.myyearofhandmedowns.com/uploads/1/3/1/4/131454345/rebebad.pdf
    • http://files.catholicsofpleasanton.org/uploads/1/3/1/4/131437225/fobonevixi_dojifikomotidir_rikutiberavukem_kopitu.pdf
    • http://files.bydivineappointmentthe5ps.com/uploads/1/3/1/8/131856160/tobinelod.pdf
    • http://files.ownbeachrentals.com/uploads/1/3/1/4/131406840/9534838.pdf
    • http://files.deborahvandelden.com/uploads/1/3/0/8/130874526/9aaae248.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/kulofimegiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/migijesidonew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/31955649659.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/72085849674.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/fefim.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4490/files/86201573878.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/jurassic_park_theme_song_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/book_bank_management_system_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/38792625714.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/list_of_ethical_issues_in_business.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e1f.bin
dd89e7898cdf19313fa04ec337ee3128db0eebf5a080ce22fc1e41dc132037e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1F 5556 bytes
font_01_sfnt_off000090fd.bin
4a43d1a26354d2a1e849213e37d6ed8a1fb70decbe72b19f414fbd1763437497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90FD 2812 bytes
font_02_sfnt_off00009cd8.bin
f75f154f4ee4d4a3687f8af8779e2062d509636f540539cf152bcc255926b5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD8 15336 bytes
font_03_sfnt_off0000cb98.bin
967d89e51290aceb8fea09c2f9e0c707663cecf1a9b826b2128538f448fdbc28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 16164 bytes
font_04_sfnt_off0000e0ed.bin
4091daf0aa9c1df05d60d6ac81ab26d69d22d23a5dccf7963fe73eca60aa97ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5412 bytes

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