Malicious PDF — malware analysis report

Static analysis result for SHA-256 c187cffa8e43d63c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-18 15:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc9d46f1ce3ccb49d30948c524da42d SHA-1: fdebdf49f9f894385db59d5b7498bc03c3f0ea58 SHA-256: c187cffa8e43d63c9b68974be58a7d61ea3c8ace498322252fd19966e5463433
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/pify?keyword=platformio+esp32+esp-+idf', is flagged as a known malicious redirector. The document body contains garbled text but also includes the same URL, suggesting the links are the primary mechanism for malicious activity. The presence of numerous external links points towards a phishing or redirection attack.

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=platformio+esp32+esp-+idf
    • http://files.sanabriaphotography.com/uploads/1/3/0/7/130740221/9410587.pdf
    • http://navel.downingfarms.net/uploads/1/3/2/8/132814930/bimuzited_zalava.pdf
    • http://files.milkearlyparentingsupport.com/uploads/1/3/2/7/132712011/tidap.pdf
    • http://files.veterinaryscholarshiptrust.org/uploads/1/3/1/4/131406663/aedb1f.pdf
    • http://files.lifeword.nl/uploads/1/3/2/8/132814241/7579357.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/85294531669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98572357872.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/chromatic_harmonica_lesson.pdf
    • https://cdn.shopify.com/s/files/1/0434/3722/8188/files/nationalism_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/pufafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/best_of_anuradha_paudwal_chhath_geet.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/javitipor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/24203209780.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_off00005d84.bin
1fe241ceb392d9d1565c5f9f4f1a34958d6ab55809f46f2c9de75b69d37f3622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 5516 bytes
font_01_sfnt_off00007031.bin
98cb0b2d9b13c084f4832ec38b449f34b17f697d7852e489e9851027d7624270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7031 11184 bytes

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