Malicious PDF — malware analysis report

Static analysis result for SHA-256 76804c6c66446ce1…

MALICIOUS

PDF

40.8 KB Created: 2020-09-14 23:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b262fe30b9dfd6d85c68b409c74cf675 SHA-1: 3ce2f1f7f50b2918e1e8fd3ac12ab3edf0a77f29 SHA-256: 76804c6c66446ce14ac6b1dd9abbec5885d30bde5039f5718ea11a96f701fc52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 26 external PDF links, many of which point to potentially malicious redirectors. The primary malicious URL identified is 'https://ttraff.club/pify?keyword=digimon+rearise+digivolve+guide', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to this site. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=digimon+rearise+digivolve+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ac72e0_35716e03e0e04122bd5f115f37c5f103.pdf
    • https://static.usrfiles.com/ugd/4dd980_a7a41e4876624885ba0bd589427815ee.pdf
    • https://static.usrfiles.com/ugd/93c935_563407c0e6564c64b0a65f3b8c38f4ee.pdf
    • https://static.usrfiles.com/ugd/882da0_ef2800562d3f4777b0845bccb50a06af.pdf
    • https://static.usrfiles.com/ugd/34e21e_7657a92ece9e4f5e82ca98208ef10d2f.pdf
    • https://static.usrfiles.com/ugd/97aff7_f7cd8aca0c744b088637f7b6e73daa2b.pdf
    • https://static.usrfiles.com/ugd/510a18_dfc1577a34b64b6ab8b9d53d3494b530.pdf
    • https://static.usrfiles.com/ugd/11baf9_0b74e9c8aa0f4476b9d2614fa9acdd5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/sivimanerufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/76644877276.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/mefelomepoberi.pdf
    • https://static.usrfiles.com/ugd/a0905b_cd5070556d9744458d5998b10b7a4131.pdf
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000623f.bin
000afa32bf5f7bb4307679aec7ddea8b8802845d7e8d7932e16795fcbc1dea5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 5204 bytes
font_01_sfnt_off000073df.bin
d48e0073abcb1d90c4f4c7367adb5be424da2958d1dbe7328efda4f609f4f550
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DF 10080 bytes