Malicious PDF — malware analysis report

Static analysis result for SHA-256 385b6b44feb9b7a8…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 12:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7737335a0d93b228324be7b8fe13863 SHA-1: 24423db76852e3241b422784943a4c27da739343 SHA-256: 385b6b44feb9b7a851f5decd3a21a253dce2c4d91c407275a044a7b4f69222bc
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious redirector infrastructure. Another critical heuristic, PDF_SEO_LINK_FARM, highlights a large number of external PDF links. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages.

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.com/wix?keyword=natural+illusionist+5e
    • https://static.usrfiles.com/ugd/b8c837_1b3c90cb8c22434b8852da9e8156bf83.pdf
    • https://static.usrfiles.com/ugd/b8c837_0680bb8b033a4a33abcd1ab6170718aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_473a88f600f445a1aba8ba4fff4a6b36.pdf
    • https://static.usrfiles.com/ugd/b8c837_d954777435494876b04efaddca530c26.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f1025a04ad5401f862ceab7ce9da77f.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/fofutulubiwukukevipaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/texepozodezawof.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/my_friend_pedro_hacked_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/cause_and_effect_essay_examples_for_college.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/suwitosofiwufi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/bunyan_pilgrim_s_progress.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/69862428961.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/90351292781.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_off00008357.bin
c6de942cd2dfa5c7cb8793900e57185e2480fd1c44a7939411bafbf7457c9e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x8357 4772 bytes
font_01_sfnt_off000093a2.bin
28a8c432c82ae84aa67dbc8663bb0092b777e5a7fbafc8aa6fc992a9a8661ddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x93A2 10416 bytes