Malicious PDF — malware analysis report

Static analysis result for SHA-256 51620ec1d385ba06…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 22:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 145424f4af90ff924552ea9b2636e3c8 SHA-1: d05ca4fb7c70a393621133b4d68d4da6a5f21643 SHA-256: 51620ec1d385ba06bdc9a4d3e3b4c21e432bc247c353294b5df70f0172510da5
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.club' which is flagged as a malicious redirector, likely serving as a lure for users seeking 'free adobe reader old version 10'. The document body and heuristics indicate a link farm strategy, with numerous embedded URLs pointing to 'static.usrfiles.com', some of which are also linked from the malicious redirector. This suggests an attempt to drive traffic to potentially harmful sites under the guise of software downloads.

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.club/wix?keyword=free++adobe+reader+old+version+10
    • https://static.usrfiles.com/ugd/e2b09b_3ce3b88f56f74b918e1303cf9904318a.pdf
    • https://static.usrfiles.com/ugd/868401_0740496a771a4e4f96b1c38577e7c43b.pdf
    • https://static.usrfiles.com/ugd/c0a468_3461cdf591384abb8e5d099e416cdf89.pdf
    • https://static.usrfiles.com/ugd/d162e3_702fb070de9d43fe97645d9689b4a611.pdf
    • https://static.usrfiles.com/ugd/9c43ec_9b3bb809f6a040489bb77d10ccd8a688.pdf
    • https://static.usrfiles.com/ugd/934fc3_4918f8262a5348dcb4e86b65301bb58e.pdf
    • https://static.usrfiles.com/ugd/e2f197_6a267f40aaca48aaaac0da31c9b95774.pdf
    • https://static.usrfiles.com/ugd/a01749_817b7b3b10db47fc9087cf30c9caa12d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://cdn.shopify.com/s/files/1/0463/5607/0561/files/jusozukonotukin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/microstrip_antenna_theory_and_design.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fe11e7c47d4433ea45e51b9abd3f34b.pdf
    • https://static.usrfiles.com/ugd/c345b0_b09fa162de6e4f4da95f6fb5a3a54f6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e73519f9ed3340439bb3c4590368a882.pdf
    • https://static.usrfiles.com/ugd/122077_ea7fa496ca7245849ae6e6a87982daca.pdf
    • https://static.usrfiles.com/ugd/d01287_aefbf63f3e2449f991189ef7ecc34875.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_off00006192.bin
b49b0ee5c6b804ca064e661f7363b04386182e783b62668dab3f90272c42f7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 5168 bytes
font_01_sfnt_off00007335.bin
8faa376bbb1be0537ad079927d6f21495566d4daf803e14c77f413209b0ff138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7335 9980 bytes

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