Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bfde4cb735f17d…

MALICIOUS

PDF

47.5 KB Created: 2020-08-11 16:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023622e911b6863844442fa4c313a3d3 SHA-1: 716d9d68ffb071d4f7bb996354410dc8ebccf4fa SHA-256: d2bfde4cb735f17d3e138af8d9ffa0aa8fffd4e99878176c9d259c45a809e112
150 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs. One URL, 'https://ttraff.ru/pify?keyword=cervical+lymphadenitis+pdf', is identified as a malicious redirector. The presence of a large number of external links, including those hosted on Shopify, suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cervical+lymphadenitis+pdf
    • http://gixapu.graphicsadp.com/uploads/1/3/1/8/131856725/6845841.pdf
    • http://files.hofstetterlaw.com/uploads/1/3/0/8/130813714/jajifes-dagesudajinu-japonuraba-sobulideraze.pdf
    • http://files.chimscan.net/uploads/1/3/1/8/131857334/7b8b96.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/26734669079.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/letimetovonisajonaxalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/76453999814.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/ziwisovuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/mejuzowizorazefomobevef.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/12916854593.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/57781059738.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/arabic_words_meaning_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/aparatos_del_cuerpo_humano.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/satetukanenozefofudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/25380972628.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b2.bin
ed184b89c2f46cb26ebd49f0fabdacaaa0eacfe2e44c9ab5dc6441c4c969134c
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B2 5256 bytes
font_01_sfnt_off00007a6d.bin
8f082f436594268a93d4b5a6ba664261fbad9fed69d624893537a0d079dc06cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6D 12560 bytes
font_02_sfnt_off0000a347.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xA347 4324 bytes