Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35525fac4371672…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 03:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14503a9095aedc63b98f0c21aefe20ac SHA-1: 59efc9eb6b9b166e07753baa447058b4baa28f6f SHA-256: f35525fac43716724a58a8db4881024cb6ee2eeae829c12222827ec511127022
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.me/wix?keyword=quantum+mechanics+500+problems+with'. This indicates a phishing or scam attempt, likely to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to academic content and the redirector URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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=quantum+mechanics+500+problems+with
    • https://static.usrfiles.com/ugd/e8506d_39675647eb4f4a0297ab0c3d5971e0f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_85c083b6b0854b4e8345a9ec73436407.pdf
    • https://static.usrfiles.com/ugd/73c254_0250db4ed2cc4bd69ebbb8b269a94385.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6d2ee43f2f314c019725d1e3acd81500.pdf
    • https://static.usrfiles.com/ugd/b7082a_50cc17281e5f4aa9916cbe8342cd2bc6.pdf
    • https://static.usrfiles.com/ugd/b11f6d_a6f626ae17f2400a9a8d231bd29d3dc8.pdf
    • https://static.usrfiles.com/ugd/4b874d_c879647ea2d54cce8a9e3d333e6e9b0d.pdf
    • https://static.usrfiles.com/ugd/599f1c_08e9c0ca04184204a253ac7178f771cf.pdf
    • https://static.usrfiles.com/ugd/3cb679_4d7398bcdbcd4b4e9d058966ca4776a6.pdf
    • https://static.usrfiles.com/ugd/9e53d4_15eda5b284bb4b4b9b8edea6f7725025.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6e368138d1145d0b65419766879260b.pdf
    • https://static.usrfiles.com/ugd/44b221_bef07b8dced64be4b03c7de09319bc96.pdf
    • https://static.usrfiles.com/ugd/8de238_9d4ae883e2204e8fa8737129ea4d4df4.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/42113580145.pdf
    • https://cdn.shopify.com/s/files/1/0454/3774/7350/files/meditation_guide_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/3187/2166/files/zack_rider_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/bokij.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_off000045f4.bin
67eea46324d02a6b3250da10bd6e0938fa8e68afc7ef8bb1d66c37465e684611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45F4 5732 bytes
font_01_sfnt_off00005958.bin
adabfe568fbcb6ca26de8eb7919f160ee8cc1f1e27057bb5bff24bb3d4d56516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5958 9452 bytes
font_02_sfnt_off00007940.bin
6eb5d02e44ca52714f0dbfcb774a3650c8b727503b3c7899118113ff9014c892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 17960 bytes

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