Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a148fc44cf9bc2…

MALICIOUS

PDF

56.6 KB Created: 2020-08-09 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4081c281b7216ff2a207c340a011803 SHA-1: 9c8687fca9fb376f7462ad90549a92a313a68667 SHA-256: a3a148fc44cf9bc26ff00b9da71ebdf0c52feaed1a3613cfbcd28f1f38909fad
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL of the malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute malicious content or improve search engine ranking for malicious sites.

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=surah+ayatul+kursi+in+arabic+pdf
    • http://vejatisir.egfhc.com/uploads/1/3/2/3/132303382/7971862.pdf
    • http://files.vetcliniceh.com/uploads/1/3/1/4/131437085/koboraxubuniwa_kajesa_pabunuminori_vovov.pdf
    • http://files.jakegrahamphotography.com/uploads/1/3/1/3/131381003/57b7755a6c10.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/uverse_channel_lineup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/american_sportworks_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/27589671882.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/kazolobuzakagu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0430/1514/3587/files/vebafebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/ford_taurus_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4803/4716/files/97112796209.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/koxuvudinefupebamuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/refokogezowipapojitozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/5_point_likert_scale_questionnaire_sample.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/javascript_sort_array_of_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/aesthetics_in_product_design.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
stream_005_off0000a6f4.bin
44a57138d8259a815dfd3506fa8d5c8752192f16afe43db1903a39263526093a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA6F4 24680 bytes
font_00_sfnt_off00006e3f.bin
8622d42338453f797615c6860253c1c1899dfaa68d0051ad7394a1bf6acbfd71
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3F 5652 bytes
font_01_sfnt_off00008174.bin
2b4d69b3c791f3c1c8df143df367a972b51c144fee443900ccf0ae25fdc17754
pdf-font-stream PDF embedded font (sfnt) at offset 0x8174 11676 bytes