Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83944f973c7e11f…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 18:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aed142e897ae4b105fb5b5b7dc1198c2 SHA-1: bbb24ac4653fb6cc56ee3a404718bf75399a9a6b SHA-256: e83944f973c7e11f60c174d41282fceb698db97f8eb84048bd32fbd9f9647b0f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to obscure malicious destinations within a sea of benign ones. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'ttraff.com', a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, further supporting the idea of a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS score of 0.999992 strongly suggests malicious intent. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector URL is the primary indicator of compromise.

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.com/pify?keyword=composicion+centesimal+ejercicios+resueltos+3+eso+pdf
    • http://files.bethlehemchristianmission.com/uploads/1/3/1/6/131606257/bofuxizovidili_pazeweviwulo_jonujibiji_bupidokokabo.pdf
    • http://mewazagis.brendargarcia.com/uploads/1/3/0/7/130776208/1aa564aafba3.pdf
    • http://xawefiteg.tiagarrawalk.com/uploads/1/3/2/6/132681556/lusaloxuzafodo.pdf
    • https://cdn.shopify.com/s/files/1/0450/7385/8710/files/2d_animation_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/us_navy_dive_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/79624557664.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/transparent_color_hex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/biwagavid.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/18126052679.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/radar_anti_jamming_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/51561769576.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/69374153308.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/bemegorunesafazib.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/97897734371.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20880330559.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/bevojikoferiresibubasujip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7226/6138/files/tokepubujig.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_off00006ed4.bin
aa9999064f0d05bc955fcb6628f6852c719ce0427d9749c809d07f625d7147fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED4 5448 bytes
font_01_sfnt_off0000813f.bin
b24b5256991f31e7f61bbadb38ffa56117395aa9831ae871c957c519dea65ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x813F 13416 bytes