Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c79077af4499c39…

MALICIOUS

PDF

57.0 KB Created: 2020-08-01 12:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16388f3b5200cebaa8eed03a65342080 SHA-1: e0f4aff93bb4be85f2d6f58c0a1bde8068c10f31 SHA-256: 3c79077af4499c391775dddc7fed0184a5ac9563eae7ebb2959173f6ec5ccd9c
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.cc/pify?keyword=free+sound+org'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site. The ML classifier also 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.cc/pify?keyword=free+sound+org
    • http://files.westwoodcheer.com/uploads/1/3/0/7/130740318/75d41eea9f90.pdf
    • http://files.messyparenting.com/uploads/1/3/1/4/131452938/fetawevejipunoku.pdf
    • http://files.laplayaatthestrand.com/uploads/1/3/2/6/132682663/fexogobun.pdf
    • http://files.leftypreppermom.com/uploads/1/3/1/4/131438056/suzowixetevexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/84209116625.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/65691060046.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/bowejawaxujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/gulevumekaratudopixeguk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/lolanuboxetegimizapegel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/78750883593.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/ginisikal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/romaronev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/44135315312.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/zididuwowabalijulureze.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2439/files/mustang_mtl20_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/mozazazufuxugejidinub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8136/files/bekitanobekoniwebonigipum.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_off0000a382.bin
7aad56fe24f2635cac52c45fa516282112e0a58de6228e091d88756e722feee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA382 4708 bytes
font_01_sfnt_off0000b397.bin
02437bc1ceb72ccd4c22a7f58a6e3796b747b9431ac6dd11fcc6b1347c5bde08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 10632 bytes

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