Malicious PDF — malware analysis report

Static analysis result for SHA-256 61310120518918be…

MALICIOUS

PDF

52.3 KB Created: 2020-08-11 08:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47ededb49420f278e9f038d72a3413cd SHA-1: 3637bb9a06f44aa117f401076ff08e684e85b791 SHA-256: 61310120518918be2505e4c3613f502ca99b68936dbf017e96d3c7317e510dcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on the malicious link, which then likely leads to a phishing page or further malware download. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=fibonacci+sequence+pdf
    • http://filebali.tfgministries.org/uploads/1/3/2/8/132814930/51f56cc3dc8.pdf
    • http://files.thevirginiacotillion.com/uploads/1/3/2/7/132740978/016e4a9.pdf
    • http://files.mattworrell.net/uploads/1/3/1/6/131606762/wizavinakezak-pijotegumi-volopetofaloren-vaxuna.pdf
    • http://files.exton-village-hall.com/uploads/1/3/1/3/131379939/dokefulima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/jupyter_keyboard_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/51311168595.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/11th_biology_textbook_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/33303331731.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/12749972049.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7933/files/doxycycline_monohydrate_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/42623094441.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/pakidefamujenaredam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/california_association_of_realtors_residential_lease_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/13516946585.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/99745069529.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_off00007def.bin
8bc28d54d95ca459d27cf9bab87c7d201aebc14866cd4341310a7727e3790eb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 5044 bytes
font_01_sfnt_off00008f10.bin
ac449c23e08f63d6ef494dc61560aec89aaf04d43f3ceb613196990f2cfe2c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F10 12084 bytes
font_02_sfnt_off0000b669.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 4324 bytes

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