Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d75a36f1f6619b…

MALICIOUS

PDF

51.4 KB Created: 2020-08-30 21:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25711191d1f5867c131dde6d0c6f4c4 SHA-1: 3c5f5e4aed03249bc7d4866b539ebf6cde67818e SHA-256: 23d75a36f1f6619b935beec3142dd6dd826ddc276df8606ae76a7444c7673d94
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.cc, which is likely used to redirect users to a malicious site. The document body itself is heavily obfuscated but contains the malicious URL and numerous other URLs hosted on cdn.shopify.com, which are likely part of the link farm.

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/wix?keyword=cost+accounting+%25252816th+edition%252529+pearson+custom+business+resources
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/outlast_2_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/typewritter_sound_effect.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/posokenufol.pdf
    • https://cdn.shopify.com/s/files/1/0463/1327/5554/files/e_bildirge_kullanici_bavuru_formu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/nivopizopiradu.pdf
    • https://static.usrfiles.com/ugd/b8c837_05a263a724ad4646896366ea5eb67207.pdf
    • https://static.usrfiles.com/ugd/a2e20a_ff56707431f5468f81d6f7141affe1a0.pdf
    • https://static.usrfiles.com/ugd/5af86b_811e82ff6cb947488130747d8b17c39c.pdf
    • https://static.usrfiles.com/ugd/217d68_a0fe9af15e5743cdbec58422bb8bd609.pdf
    • https://static.usrfiles.com/ugd/79e0dc_de29637d05234af686cecf2af8d3246d.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/rocksmith_2014_all_updates_and_dlcs.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/73878268787.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_off00008812.bin
7f9561dd502daf05061431caff82bad5fb0a6acac44b9bb4695aa0f98bccf75e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8812 5860 bytes
font_01_sfnt_off00009bdf.bin
fdfb915563459659c05d0c14184f2e2702082b99191a0504179cd419322f6dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDF 10804 bytes

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