Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7b9311daaff0e7…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 02:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b0352465d456fbd5fd5ee93de9a3ab SHA-1: 0d5207bdc2e1c3ce147c8c70fa4fe392fa4385b8 SHA-256: 0f7b9311daaff0e73a1aa1cc71a0da6e4d82edeea5c29a467da0b095913ef418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.com/wix?keyword=gchq+puzzle+book+questions+and+answers', is identified as a malicious redirector, indicating an attempt to lead the user to malicious content. The document's structure and embedded links are consistent with a phishing or social engineering lure.

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.com/wix?keyword=gchq+puzzle+book+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ea78e0_6782783c755a40aab09b0c525598fc6c.pdf
    • https://static.usrfiles.com/ugd/58a813_aba7ae8279464825a92ff5538a2428a8.pdf
    • https://static.usrfiles.com/ugd/52b593_e94ccd9784b4419caf26cd6713c2c383.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bcdf6cb6138444387f37b9c07b1e985.pdf
    • https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
    • https://static.usrfiles.com/ugd/e23fbb_0aacc21c44b5420bafae48048750cb32.pdf
    • https://static.usrfiles.com/ugd/739437_323b9a855dd941a4881c0cd52f4c1920.pdf
    • https://static.usrfiles.com/ugd/e02969_3a16a25d3b1045a0b574f00b77e5afa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_28e3e3daad48408fa536b1a636621400.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7471/files/vujugalajudozir.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/oxford_bookworms_stage_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/85870251839.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbdd8039c4d94a20a1dacf8571ad8fef.pdf
    • https://static.usrfiles.com/ugd/b8c837_f601a48014ad4ce6a86afe8b1550cd5c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a2.bin
3a3cefabbb566b0e2f82def518817e917d52ce3ce07487490ff5891f11d282d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A2 5548 bytes
font_01_sfnt_off00006b88.bin
a9e46cf6315f64aeb43c506ed03376247ca529be12b8ae4274ede5da252ffc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 10380 bytes
font_02_sfnt_off00008ee1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE1 4324 bytes

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