Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8e7554b23fd822…

MALICIOUS

PDF

42.6 KB Created: 2020-08-27 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e3bf43ea85183283c924c0dbbbe6ae SHA-1: 7ae70bdf4153bbfee188f678cff81ce43bafea2b SHA-256: 8e8e7554b23fd8228ddd4d26ad09e6e94a94406338b9d981bebab89811dbe1ce
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=acquisition+accounting+deferred+tax+asset, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several other URLs hosted on Shopify and other domains, suggesting a content-driven lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=acquisition+accounting+deferred+tax+asset
    • http://files.settingsfalmouth.com/uploads/1/3/1/0/131069764/lurofexedunuko_dekodilone_jizuravu_zujasidibibe.pdf
    • http://jodaxiw.impulsivelust.com/uploads/1/3/0/8/130814187/dereruna-gesemikevuwo-nevoz-vonomarono.pdf
    • http://files.shopbohosouth.com/uploads/1/3/0/7/130775551/midawepukake.pdf
    • http://dirurorob.artartmargaretcameron.com/uploads/1/3/0/8/130874565/waxaro.pdf
    • http://files.thesportscourtblog.com/uploads/1/3/0/9/130969357/e55339.pdf
    • https://cdn.shopify.com/s/files/1/0428/8000/8355/files/blackboard_collaborate_launcher_mac.pdf
    • https://cdn.shopify.com/s/files/1/0464/8904/3112/files/oxford_dictionary_free_english_to_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/80758624125.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/wavuxewikagaziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/61882718007.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/31720842932.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/kazegexavugewuzexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/ethiopian_grade_9_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/tally_erp_9_voucher_entry.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_off000067f6.bin
c41cb75a97b8845fa6f6fbe488deb91ae3ae48751a8dbd7b0fe880df6bbfb480
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F6 5340 bytes
font_01_sfnt_off00007a2c.bin
4d1be0db91e30d1a0589c203043dd09f3ea64ab85a958c83801d0b9f500bb966
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 10424 bytes