Malicious PDF — malware analysis report

Static analysis result for SHA-256 8467a09dc03ee1d2…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 04:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 041219324b044993085c789c071bc8b5 SHA-1: d7be3f2451c35eafa75c67193c82676251177780 SHA-256: 8467a09dc03ee1d2c33e1423b6dcabc053dfd54fa610d741d01292ccb1ce86fa
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to seemingly benign PDF files hosted on Shopify. However, one critical heuristic firing indicates a link to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=15+sentences+with+second+conditional'. This suggests a social engineering tactic to drive traffic to malicious sites, potentially for further exploitation or phishing. 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.cc/wix?keyword=15+sentences+with+second+conditional
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/differential_equations_polking_boggess_arnold.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/gudupokod.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/rewefifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://static.usrfiles.com/ugd/b7ab08_372656d53fbe4a03b44ca497cbeb80c4.pdf
    • https://static.usrfiles.com/ugd/ae059d_609ddb70e2624aa587186a8b5502dd3c.pdf
    • https://static.usrfiles.com/ugd/c5d40f_5b3963e9a9124cdc9b8913e3b62812d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_17772981c6da43f3936d302466e8daf8.pdf
    • https://static.usrfiles.com/ugd/e3c460_43bf0da2639b435190a7ae659598b515.pdf
    • https://static.usrfiles.com/ugd/b65acf_1f44d261638d4dab9d190fa81850b226.pdf
    • https://static.usrfiles.com/ugd/b8c837_7591dcc17de04f69aac1113b6b9d1fc8.pdf
    • https://static.usrfiles.com/ugd/2f07a1_cd4dcaee8367409abef10e1e0b312ad8.pdf
    • https://static.usrfiles.com/ugd/81d6a4_e38dd220c2a641f9b1beeefd4c044408.pdf
    • https://static.usrfiles.com/ugd/90c678_220decbf169f483ea483de4f91c642e4.pdf
    • https://static.usrfiles.com/ugd/f96b02_335e7dc7c6c346a6963d859a71cf4b85.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_off00005f31.bin
534d5ac2a00046add0caf0a5fa59f526a3f4d2162b8620a0b75f4936046349c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F31 5104 bytes
font_01_sfnt_off000070a0.bin
d949d031313fee5b005e21cadbca811aa1d9a4d10a3598707139f02070db4b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A0 10316 bytes

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