Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e9961c10a6d438…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 17:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02369be77cbf4cfd5c7c64054a68acd5 SHA-1: e3377cd9d3da3b882afec7a73321eb2cb6fd4b53 SHA-256: 90e9961c10a6d438e5649c7940e51308011eff27f03a890c3e2287d04044e228
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to ttraff.com, which is used to lure users with keywords like 'integers grade 7 worksheets'. It also contains a PDF link farm heuristic, indicating a large number of external links, many of which point to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector suggests a phishing or scam attempt.

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.com/wix?keyword=integers+grade+7+worksheets
    • https://static.usrfiles.com/ugd/b8c837_6d57cba6b310472eacc6fa0700ae7b31.pdf
    • https://static.usrfiles.com/ugd/36f25b_650af7df539b41288483fd6db46da68f.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/865d50_3b0d157f23a340f794477786acf4fad9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e7bc79e0ba34dc097d6464112ca8e8f.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/93402328359.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/wepebopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/57137148848.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7093/files/car_agreement_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/kiran_publication_ssc_stenographer_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/zonujipidetodapoxawex.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2515/files/pebakefilemorelufugemete.pdf
    • https://cdn.shopify.com/s/files/1/0431/1180/9190/files/boledagitizubavubur.pdf
    • https://static.usrfiles.com/ugd/253000_353d4f3e4bf94f26a37c80c1171dd781.pdf
    • https://static.usrfiles.com/ugd/b7306e_858926279edc4f94b07776462ba8e8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_70e854ce6a3d4db89aedaaf136a267a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_49723570578744938ae893b0c9c2b14f.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_off00006376.bin
4b0d8b9ddc3db0c3e3358bcb0f33ece665be201173c76262c1a6ad44d936a815
pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5228 bytes
font_01_sfnt_off00007553.bin
3851901bd20308f2c4cfe578d46082c1cbcb7dd3fedccbe65085024c37798c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 10256 bytes