Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51204817b77c57…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 04:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb20775ce5df7a945df352fabd5c476 SHA-1: 95388bf050295f36378bf0ee7811e55729b13c4f SHA-256: 4b51204817b77c577d0e176dc36300723e09e6b4a70026d5284e148f35a631b9
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for MP3 downloads. This indicates a social engineering attempt to trick the user into navigating to a potentially harmful site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious link and the PDF structure itself are sufficient indicators.

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/wix?keyword=lionel+richie+ordinary+girl+mp3+download
    • https://static.usrfiles.com/ugd/b8c837_423da957b24945749e3364e832b5d02a.pdf
    • https://static.usrfiles.com/ugd/2c608b_0c2116e19dd94941a4b860f1ebd5cf6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba0a978e0bb41e2972748cc6b0578d4.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/bachelor_in_paradise_episode_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/wisadoximebegejarif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/que_es_epistemologia_de_la_investigacion.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/blouse_cutting_and_stitching_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/psat_practice_test_1_section_4_answers.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/sotetudutadawamivufad.pdf
    • https://cdn.shopify.com/s/files/1/0444/2531/4471/files/peter_pan_short_story_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0440/6919/1832/files/libros_para_colorear_gratis_frozen.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_off0000507f.bin
bfd26e8b9aace9384c1c5254eccedfc1e32122bd7534c071d29e30d3e67f8927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x507F 5316 bytes
font_01_sfnt_off00006266.bin
0813c955d30e156c6a386d0f6aa48fc9e553a8dcd8719e999ec60acb55c958e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 10344 bytes
font_02_sfnt_off0000857d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857D 4324 bytes

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