Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d20525ff1aad3…

MALICIOUS

PDF

95.2 KB Created: 2020-08-24 11:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 106c933a707abc564f265351939dbd1d SHA-1: 4e0add2be7d176d73e95c0e9d2798a1a87908adc SHA-256: 7c5d20525ff1aad3d2b82b5655ba81a1fb02306a0f0ae9da273be95dabadf462
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. One of the URLs, ttraff.com, is flagged as a known malicious redirector. While no scripts were extracted, the presence of numerous links suggests an attempt to manipulate search engine results or redirect users to malicious content, potentially as part of a phishing or spam campaign.

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/pify?keyword=treatment+of+hepatocellular+carcinoma+beyond+international+guidelines
    • http://files.hotairballoonfiesta.com/uploads/1/3/0/7/130776462/davuve.pdf
    • http://files.joshraftery.com/uploads/1/3/1/4/131453432/mizib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8259/6008/files/bach_partita_no_2_allemande_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/statistical_modelling_in_pharmaceutical_research_and_development.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9600/files/39635564139.pdf
    • https://cdn.shopify.com/s/files/1/0452/5555/7280/files/2nd_grade_reading_books_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/how_to_rename_file_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/create_prefab_unity.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9564/files/30661693194.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/callan_method_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0447/5761/4741/files/arc_length_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/68030056130.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001163b.bin
4f1f590baeb9a9e4ada5896f6b28fc1e33e856057ca329bb2a978c6d5ca04c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 5760 bytes
font_01_sfnt_off0001299f.bin
f82924e5b5189f1586f1e5caeea1a4aaa4bb889611bf65334e0280e3f27812c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 15576 bytes
font_02_sfnt_off00015a71.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A71 16060 bytes

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