Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe2765c7ac4bdb…

MALICIOUS

PDF

34.2 KB Created: 2020-08-10 11:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acee1943ca21cc9e57d941c047fc30c1 SHA-1: 8e60f7cfee5d4a32ce9ce6180b7ebff81120975c SHA-256: 0cfe2765c7ac4bdb43b6b5c969008b57382addad65a3d63085f367f13d900266
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lure users to malicious content. The embedded URL 'https://ttraff.ru/pify?keyword=boletin+informativo+de+deportes+pdf' is a critical finding, suggesting the document's primary purpose is to redirect users to potentially harmful sites. 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.ru/pify?keyword=boletin+informativo+de+deportes+pdf
    • http://files.eco-literate.com/uploads/1/3/2/6/132681694/rojevexosulexum.pdf
    • http://files.ellibrodeespanol3.com/uploads/1/3/1/8/131857540/fewupabixavola.pdf
    • http://files.charlottecblack.com/uploads/1/3/2/3/132302759/novurovop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/35878563109.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/84993221155.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/41687664810.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/learning_disabilities_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/97957258002.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/59909741883.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/construct_2_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/pakotalisubebez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3099/4326/files/89784486597.pdf
    • https://cdn.shopify.com/s/files/1/0431/6695/7722/files/nufozofirakuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/zulafipivewone.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/android_init_rc.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_off0000467f.bin
b8a41885eec56bda0b94b7b752a2cf8c58b83c65b7a67d3d490e89f46961e0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x467F 5296 bytes
font_01_sfnt_off00005870.bin
b8452f42b8c567ab76ec79b952aeceaa6f6b090bee44fcc1c693a68c6a00eef4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5870 10428 bytes