Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d7f025104751d6…

MALICIOUS

PDF

43.2 KB Created: 2020-08-03 00:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ea25decf44439d3494d37bd5e74588 SHA-1: a2a614ce5aef5d4f43c2ef24474f54476d4ae437 SHA-256: 13d7f025104751d64f1e45ede46df817a525c82a86a29459fd0f77e5387cf700
154 Risk Score

Malware Insights

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

This PDF document contains a mass of external links, including a prominent link to the malicious redirector `https://ttraff.com/pify?keyword=dark+souls+2+mad+warrior`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, supporting the presence of these malicious links.

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=dark+souls+2+mad+warrior
    • http://files.saugusxc.net/uploads/1/3/2/6/132695543/goloxiv-mired-zakobegoselaten.pdf
    • http://files.hertssarc.org/uploads/1/3/0/9/130969470/sinegisiwexivonunof.pdf
    • http://files.millbrookrotarydirectory.com/uploads/1/3/0/7/130775846/d99ea.pdf
    • http://files.glendyyeung.com/uploads/1/3/1/8/131857305/902577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/95913502253.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/biological_psychology_james_kalat.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/86652584286.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/inherited_hemolytic_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9648/files/livojimulola.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/nosoxakifuvib.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/zexebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/66047441656.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/dumilogiwevanum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/bufosaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/vexabov.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_off00006b48.bin
6bbb5f261c0b22da8bb25265b9cd60f8decf2ee46aae698169453ce396a77d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 5256 bytes
font_01_sfnt_off00007d2e.bin
e8028c7829c17e32dc06034f797f2340bd68c0d5a84956128494e5757f9087c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 10104 bytes

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