Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e0225f8a3c710…

MALICIOUS

PDF

60.3 KB Created: 2020-08-20 02:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a357e86e548dc51f959de57f8acdd55 SHA-1: 7aa88185197696d6b80e2add9c64b940d5933709 SHA-256: 5b9e0225f8a3c710caadf5815a3b6cba3d500921aa3aff374612ecdb0ae4b7e9
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.cc', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF titles, likely to disguise the malicious intent. No scripts were extracted, but the presence of numerous links points to an attempt to redirect the user to malicious infrastructure.

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=distribucion+normal+campana+de+gauss+pdf
    • http://files.morning-side.net/uploads/1/3/1/4/131483830/f850ac31d55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5949/2502/files/principles_of_sensory_evaluation_of_food.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/cambridge_primary_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/breeders_cup_2019_betting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/xolesozepisisolifasejunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/gukedubosozosu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/gesijasukapixapebasiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/is_there_a_color_code_for_transparent.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/bawupibep.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/wanerilurajofuge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a25a.bin
067537d369a6467526232e03c80aaa21e4b32d7326ac342264a63f4ea1d4af0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA25A 5612 bytes
font_01_sfnt_off0000b550.bin
bc35604acb20dc83b6450133ee7adf2dfa7ed40868730c3db9c9af243b790e37
pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 15248 bytes