Malicious PDF — malware analysis report

Static analysis result for SHA-256 413f66b8a5dc6400…

MALICIOUS

PDF

51.0 KB Created: 2020-08-05 23:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085795346656e705b69e0807745a5030 SHA-1: 20c2affee87d8d3dc3c8df3793bf455ee8496864 SHA-256: 413f66b8a5dc64008d95f0a361f5c5c7c74b4f105284640051eeb678ea80360c
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, a technique commonly used to create link farms for SEO manipulation or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/pify?keyword=asme+section+viii+div+1+latest+edition+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains metadata related to wkhtmltopdf and a URL, further supporting the malicious redirection attack pattern.

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=asme+section+viii+div+1+latest+edition+pdf
    • http://notuvub.ulcel.org/uploads/1/3/1/6/131606201/pojuxemogukek_gabonul.pdf
    • http://files.arabiclearningcentre.com/uploads/1/3/1/8/131855995/mekotamefebozosu.pdf
    • http://files.3mbc.org/uploads/1/3/0/8/130815115/xevek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/razabaderitulido.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/60522862880.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/install_github_mac.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/macintosh_network_utility.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/free_comic_book_files.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/41468425096.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/39746767119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20136550696.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/brihaspati_vrat_katha_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/gta_v_pc_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/mercury_black_max_150_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/1181925468.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/koxiwijoravulaxuxe.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_off000089a8.bin
cd628dd2d02a91d056b1a9db71a877372f494b2c43eaa221d33c7cffe59f397b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A8 5308 bytes
font_01_sfnt_off00009bb8.bin
50aace1780689eddaf282d98bc9e2eebcc788726bc410ec6bd688df29629be9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB8 10228 bytes

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