Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42bae8d2439fdf5…

MALICIOUS

PDF

48.3 KB Created: 2020-08-11 20:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91520564cd1d9986d82f514f290ddc1 SHA-1: 82fabbe33801fe06f12a1ed38dd84e88964b0578 SHA-256: b42bae8d2439fdf5b2a9f2984a3039c0f7e51d8c8dd6cc4330833a3ab652c436
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to manipulate search engine results, directing users to a malicious redirector. The primary malicious URL identified is ttraff.ru, which is linked to a keyword search for 'digital baseband transmission and recording pdf'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports the SEO link farm heuristic.

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=digital+baseband+transmission+and+recording+pdf
    • http://linaja.saramwills.ca/uploads/1/3/1/3/131380600/841565.pdf
    • http://files.prayfornoah.com/uploads/1/3/2/7/132740905/luwijerufabi.pdf
    • http://files.laviproject.org/uploads/1/3/1/4/131453399/bitiliz.pdf
    • http://files.truahealth.com/uploads/1/3/0/8/130874086/kikudakinedexer-moxesu-talulop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/english_short_stories_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/bakulotagulowe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/zimepoxop.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/25700241270.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/39790549941.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/49784247919.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/66740647074.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/11564084727.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7370/files/76022531153.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/course_2020_administering_a_sql_database_infrastructure.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/birawewizomafuxojup.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/15552206238.pdf
    • https://cdn.shopify.com/s/files/1/0428/7725/5836/files/retupudofomefefenamakikeg.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_off00006a27.bin
d9a238b11566aa45252fbb68d671c2762c8ea128826653a418a0af21e8961e78
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A27 5612 bytes
font_01_sfnt_off00007d1c.bin
1b8cde9b8e1d837d9670500ea3d230a46f3ce93de021ed90a11c2b700365cd8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1C 9960 bytes
font_02_sfnt_off00009f65.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F65 16036 bytes