Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3730bb30862690…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 23:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c4cd355ce217141777577bba351618 SHA-1: 852cacf584fd4e40547aeaf6f2b129357cd492aa SHA-256: 3a3730bb30862690f00d8a21ab6a57866bc53525a84a0e215d640661bf3b3b61
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cricket+match+game++for+windows+7'. The document body also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many pointing to benign content, indicates a link farm strategy to improve SEO and potentially mask malicious activity. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=cricket+match+game++for+windows+7
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/contrast_conjunction_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/73237781047.pdf
    • https://cdn.shopify.com/s/files/1/0436/4127/4521/files/budgeting_basics.pdf
    • https://static.usrfiles.com/ugd/21e6f2_bcce2309593d4684b52159cc700fdec9.pdf
    • https://static.usrfiles.com/ugd/77eba6_66300d62d4d647108ef4e7acdc785c23.pdf
    • https://static.usrfiles.com/ugd/b8c837_166c583fa7264da5955d4ece513af4a4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/ruliwim.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/vetoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3151/files/yorku_1620_pilgrims.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/73137817904.pdf
    • https://static.usrfiles.com/ugd/234f58_6810ef3d38314ac09425a154411357a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4b78f0c91ff4000a4e5cf4d52f44875.pdf
    • https://static.usrfiles.com/ugd/ca300b_897deffc04864644b823c55a5d92f823.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1aa3331b76b4f1cab0b80ad2e97d24b.pdf
    • https://static.usrfiles.com/ugd/99a8f2_e23fc2770a634d17a7a1f11d34eafdcf.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_off00007cf9.bin
1a890452b6b9e04c5b8d51685dc75d4f78dd349f53a6ece66c149af4467b917f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF9 5452 bytes
font_01_sfnt_off00008f75.bin
7be48db8b4d72ed331a4f8222a8d8bcb30e18ae1040f4875b1f8cc91eca453a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F75 10512 bytes
font_02_sfnt_off0000b362.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 4324 bytes