Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8ab148e48d57bc…

MALICIOUS

PDF

46.7 KB Created: 2020-08-14 18:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f0d76438a5202bf5503041bee97556c SHA-1: 3fcdb11076c603fa7e1eb46a4d8ea68bf5a6a851 SHA-256: 4f8ab148e48d57bcf9af161800d30d1b92e047c1d81552c7b9701f70d9573a94
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, many of which point to external PDF files, characteristic of a link farm for SEO manipulation. One critical heuristic identified a direct link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=guitar+chords+chart+with+fingers+pdf, which is the primary malicious IOC. The file's purpose appears to be to redirect users to malicious sites under the guise of providing a useful document.

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.cc/pify?keyword=guitar+chords+chart+with+fingers+pdf
    • http://files.stevannovakovich.com/uploads/1/3/1/0/131070051/5961779.pdf
    • http://files.glasgowscottieband.com/uploads/1/3/2/6/132682093/xavibepajutab.pdf
    • http://files.menardthailand.com/uploads/1/3/1/4/131407511/wujanodibofodonopino.pdf
    • http://files.motherwrenstudio.com/uploads/1/3/0/8/130873932/luxejazeziriz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/zojakag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/tuwuwafujafawinomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/2006_vw_passat_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4761/5649/files/zakuxomobuzimexuluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/89829019571.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/25108094651.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/sebop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/12070656299.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/3762603888.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/rujiwomoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/84646681847.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/mpje_study_guide.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_off00006a2e.bin
405ae31fd94278ed8a0093d262e1360da41de4d56f47daed86c5654f2298ec7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2E 5388 bytes
font_01_sfnt_off00007c92.bin
e2e89abcf79be54e57e1ccff5725507356ed446ce567b3ef08c423c311ed6961
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C92 10480 bytes
font_02_sfnt_off00009fc3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC3 4324 bytes