Malicious PDF — malware analysis report

Static analysis result for SHA-256 37970fae3b3ac4f2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adf67820e897af1677a445fe900e8e7a SHA-1: aeff27a678c48c6eacb2a95f436f3197580fd164 SHA-256: 37970fae3b3ac4f22bbf32b74b7541a3825b66d49119919c0314182af6e4c610
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 resources, indicating a link farm. One critical heuristic firing identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=tratado+comercial+definicion+pdf. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and several benign-looking Shopify URLs.

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=tratado+comercial+definicion+pdf
    • http://files.libbyyouthsoccer.org/uploads/1/3/1/1/131164236/vovapawigesidibaz.pdf
    • http://basar.dectfl.org/uploads/1/3/1/4/131437987/9267262.pdf
    • http://files.thesocialsguy.com/uploads/1/3/0/8/130815381/8d0647ecdfd8.pdf
    • http://mabuno.lebonearchitects.com/uploads/1/3/0/8/130814328/jovikukupovebebem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/54970466349.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1128/files/62813554286.pdf
    • https://cdn.shopify.com/s/files/1/0437/6772/6232/files/best_annotation_tool_for_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/17249153299.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/74096388165.pdf
    • https://cdn.shopify.com/s/files/1/0435/8881/2959/files/algebra_1_standardized_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/2784/7576/files/armed_forces_of_the_philippines_service_aptitude_test_reviewer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/68841670776.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/95618711995.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/vesenovopebimuvu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/technical_drawing_basics.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/41520983404.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_off0000676f.bin
acdf5d5998c9950afdc1349b5418b8e11ed907697a0ad40cbc6bad79ca7d79c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 4860 bytes
font_01_sfnt_off000077cd.bin
5a1311e33947614ca82df18d666f1cc63536c4a144ff6992c3a5c0f0a13b9ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 10604 bytes
font_02_sfnt_off00009a6a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6A 4324 bytes