Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e3b75f3c79a10d…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 23:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e9d3639a54e8045b30df2ce088ac352 SHA-1: 2f419dea2de1acf3248b2a2d289bfed9f07c2940 SHA-256: b3e3b75f3c79a10d0d5b203dcc36915561d286f94eabec6038e96ba041233112
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector at ttraff.ru, which is disguised as a job interview question and answer sample. The file also exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, many hosted on Shopify. The primary malicious link is to ttraff.ru, suggesting a phishing or malware delivery attempt. No scripts were extracted, but the presence of malicious links and the overall structure indicate a high likelihood of a phishing or exploit delivery mechanism.

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/wb?keyword=job%20interview%20question%20and%20answer%20sample%20pdf
    • http://files.sdundiagnosedsupport.com/uploads/1/3/0/9/130969826/fokulekuj.pdf
    • http://files.dohagardenclub.com/uploads/1/3/0/7/130775009/fezapozoj_jedetiwiwa.pdf
    • http://wopam.ericasclassroom.com/uploads/1/3/2/7/132741334/7213095.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/rurininedasidetofisipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0435/0260/0356/files/20719866362.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bifazerekabilasolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/dependency_in_dbms.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/436281444.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/senanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/tuxuvojomusudazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/quizlet_hack_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vunususojorimit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/kivetuladu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/82055024982.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_off0000644e.bin
094cfdd6a2db92d8500a09a339f2b5d793eb2b9ee5c39ca9af902b48b10f7aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5596 bytes
font_01_sfnt_off00007748.bin
2e3fc8d9da64e714ce227336858afc3f9706ae65c79462c58f074d570de6a861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7748 9996 bytes

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