Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c4d4d9632a8d78…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23c0a8c02da4d0df66006a3c0b037117 SHA-1: 56fc46e6737563cf64353c4c5749fc5504190bc3 SHA-256: 50c4d4d9632a8d7853d99805d692b6196dd872952db40ba667082ec46d1dbcbc
154 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.cc, which is disguised as a movie download link. This indicates a social engineering lure to redirect the user to malicious content. The PDF also contains a large number of other embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=avengers+tamil+dubbed+movie+collection++tamilrockers
    • https://static.usrfiles.com/ugd/455f95_2858ce2b9e5547d68ee158c69e0053a4.pdf
    • https://static.usrfiles.com/ugd/bf650e_b447d750b1b341c3b6c5ee32fb837ac6.pdf
    • https://static.usrfiles.com/ugd/41a0b6_d8160cced8f3427e8ff50a065ecdf0e1.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_cb358e03819b42698360fd8dad602adc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/vertical_balance_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/printable_bubble_answer_sheet_1_100.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29876283886.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/danobifopikagipula.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba1575a95e042ae8e625d3dd533067c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a8e558f2e084f9bbdb3e8fb9e034ad9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c47477d0a47479489360f4e2d25dbbc.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_off00006483.bin
cd6b0bf7f369620919add6fa99e460d1aaa4117b737a8b8622955ffcafa20940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5512 bytes
font_01_sfnt_off0000771f.bin
22a5ae3d4553851179a7c637fc710e1ac84edeb8721b1939e1ed0c6398d70f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771F 10504 bytes

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