Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe541a12bc1ea54…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 20:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3eac75df66c30013a3dbe8ee4f0d92f SHA-1: a8b495dcbb58ba3ef5b17c8ffdb9ea7138bc725a SHA-256: dbe541a12bc1ea544484d0583f35d64db3ad71d5a9286bd4e7cc41f5a7653767
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is presented to the user within the document body, disguised as a link to academic resources. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to distribute the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=principles+of+agribusiness+management+5th+edition+answers
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/modesusugewexikeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6767/8618/files/jasixukiputazan.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/ashoka_chakravarthy_telugu_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/zumavewijugesirifalesebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/mecanismo_de_ao_dos_barbituricos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2967/files/zovudugozurufuwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/xumapikagunagikigulatir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6490/8181/files/bkav_pro_android_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9797/files/tigefusu.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f942ffbf94a42d18c802cc273553ebc.pdf
    • https://static.usrfiles.com/ugd/5ed537_aff4e0719f80401fa8479163f6f255f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d424ac2844b1474390a801dd8b290f2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ab0980297443a1909110a7b0a5402f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.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_off00005bd0.bin
727265d2ed97e5d0a9aaf4b30db126798e34aa9a3bf2a8750ccee554d918a360
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD0 5808 bytes
font_01_sfnt_off00006f66.bin
217c513754cf4eaa52a35d46398c51241bc9ceead241de894b270373b2e4dfa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10992 bytes
font_02_sfnt_off00009427.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 4324 bytes