Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4e23f11f4129f…

MALICIOUS

PDF

43.2 KB Created: 2020-08-28 05:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbda50fb95e7b4b9591571e74eba93c0 SHA-1: 83ea39ed241daf63878d8a1ad8a4a456d13637be SHA-256: 41b4e23f11f4129f798cf7f68a82b5c553245cc8738d9255ae8351c37f457530
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=lista+tascon+pdf' which is a known malicious redirector. Additionally, the PDF is identified as a link farm, with many embedded URLs pointing to external resources, including a benign Shopify URL. 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=lista+tascon+pdf
    • http://files.chicagosummeropera.com/uploads/1/3/1/8/131857890/8360767.pdf
    • http://files.ontarioreportcards.com/uploads/1/3/2/8/132814989/9d969ff6b39.pdf
    • http://files.evergreencommunityorchestra.org/uploads/1/3/1/3/131381450/jenid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/kokasufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6275/files/gamespot_days_gone.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/95479139587.pdf
    • https://cdn.shopify.com/s/files/1/0440/4009/3846/files/bagaliralerito.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/how_to_become_a_good_programmer.pdf
    • https://cdn.shopify.com/s/files/1/0438/0049/4237/files/99333020728.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/arduino_library_reference.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/virgin_mobile_broadband2go.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3821/files/today_lokmat_news_paper_aurangabad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/figewobunalajomubefate.pdf
    • https://cdn.shopify.com/s/files/1/0430/8320/2711/files/arjun_patiala_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0456/9143/7215/files/adagio_for_strings_sheet_music_cello.pdf
    • https://cdn.shopify.com/s/files/1/0445/8813/8660/files/free_blood_pressure_chart.pdf
    • https://cdn.shopify.com/s/files/1/0440/2534/8261/files/10161902686.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_off00006d8f.bin
bb41e9001788558d3b5aa71237190d440d331223b08a7dfac8de263353315696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 4964 bytes
font_01_sfnt_off00007e7d.bin
5087dd8ce2982b2b8586bf5d968e1e3af658a134dcbad0f8594fec675271e2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7D 9812 bytes

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