Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3621ec9a3d2863…

MALICIOUS

PDF

45.2 KB Created: 2020-09-17 12:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116ece428a2be4b6760e6bfd902975f2 SHA-1: 40c175c9318f17b023db2965ee2d8252f7c102b0 SHA-256: 7d3621ec9a3d28630b329f576c0b45f8f8d5d1872c1e27a39dbc69dfa387aa75
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, contains the URL 'https://ttraff.me/wix?keyword=the+pythagorean+theorem+answer+key', which is flagged as malicious. The presence of numerous external links, including one to 'cdn.shopify.com', further supports the link farm detection. No scripts were extracted from this sample.

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.me/wix?keyword=the+pythagorean+theorem+answer+key
    • https://cdn.shopify.com/s/files/1/0432/9124/6747/files/batman_returns_game_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/tivaxigowexotelejeneti.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/jalas.pdf
    • https://2a8064c8-4c79-4fef-9786-7f9368ac239d.filesusr.com/ugd/c8df25_0c995499cd514c34ba5a0ca23e62d019.pdf?index=true
    • https://863e6be1-5ac2-46ef-bb05-c981f751bf7a.filesusr.com/ugd/90423f_400e968d7d5b45dda6d59f0a9c7bb328.pdf?index=true
    • https://092f7166-a3ba-4c51-8828-86653c1f387b.filesusr.com/ugd/120874_15c3b62a73124528b398f4734a1adb93.pdf?index=true
    • https://fe4d71f1-c395-4f85-9d98-753ac6fb1c82.filesusr.com/ugd/b65acf_527a7a97cd0043a09b077466b2cd6ff3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/3081257923.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/basilea_1_2_y_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/8329/1029/files/dusalibelaletizimada.pdf
    • https://cdn.shopify.com/s/files/1/0432/7440/3996/files/78621445142.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/rarowokob.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/2234021512.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_off00005e20.bin
a602af543b5601c38b8903043c63290674077243954582a74dc9b15e742e3b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 5408 bytes
font_01_sfnt_off00007077.bin
b0a99d89bf6b47ba19253ceed2dde1d3ab26cd88ee0eda1e1b56ebce5b246c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 9968 bytes
font_02_sfnt_off000092b7.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B7 16148 bytes

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