Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec27e5f7c01c33b6…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 04:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c82a9d59bca729d121efb0821b03a4 SHA-1: e008dc0d7ab7c6eaec687088fe583df61b2328fa SHA-256: ec27e5f7c01c33b66bf9258a771c0dbda8c7d22867eddcc7ed374e3eb215dc18
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=multilingualism+thesis+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via the redirector.

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=multilingualism+thesis+pdf
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdf
    • http://files.rebuildingself.com/uploads/1/3/0/7/130775753/b8c0e53e53.pdf
    • http://files.treadorthopaedics.com/uploads/1/3/1/3/131398268/622e2aa5b81.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/60132349530.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/rapidex_english_speaking_course_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/3274240865.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/spivak_differential_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/86809680809.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/penofofuvenudibogoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/allan_holdsworth_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/dejele.pdf
    • https://cdn.shopify.com/s/files/1/0434/9958/5696/files/peanut_butter_making_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/fizoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/93950673082.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/wordly_wise_3000_book_5_lesson_7.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_off00006302.bin
a8362d7b44ba44fda4689e7afbd9b30a100d664b3e96743c40c53ff845ceba06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 5364 bytes
font_01_sfnt_off0000752d.bin
0307b0f65cee2d58245ade1830f13b01817984cc8f72872b6046b49c03454abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752D 10040 bytes

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