Malicious PDF — malware analysis report

Static analysis result for SHA-256 381fb9c93abee5ab…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 14:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89ec19778cff7a76bdcf187b10fe2f4 SHA-1: dd346fd2f70ea1770b247ff35083cade531d660e SHA-256: 381fb9c93abee5abe9bb93c339ff03dee558e56f823b67942d07a7dec65f7683
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=botanica+libri+pdf'. Additionally, it features a link farm heuristic, indicating a large number of external PDF links, with the first being 'https://cdn.shopify.com/s/files/1/0463/3214/9915/files/honey_bee_songs_karaoke_free.pdf'. The ML classifier also strongly flagged this PDF as malicious. These elements suggest the document's primary purpose is to redirect users to potentially harmful sites.

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.cc/wix?keyword=botanica+libri+pdf
    • https://cdn.shopify.com/s/files/1/0463/3214/9915/files/honey_bee_songs_karaoke_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/68382436578.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/52322362271.pdf
    • https://static.usrfiles.com/ugd/04e6f9_c6d304bb08984c3ab2b5cb5842cdcb05.pdf
    • https://static.usrfiles.com/ugd/4bb894_c010c527da8841299dca3236861b6df8.pdf
    • https://static.usrfiles.com/ugd/b0b521_95f3f149a57246df9821fed95f9fcd67.pdf
    • https://static.usrfiles.com/ugd/628a76_ff82ec95503f4fcbbd2e437346f7a2f8.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/spelling_bee_musical_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5783/files/56915945019.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/aortic_dissection_guidelines_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/8109/7631/files/94814789863.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/zuderetokefiw.pdf
    • https://cdn.shopify.com/s/files/1/0460/0653/4303/files/does_curacao_report_credit_bureau.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e8.bin
ad8b90b60f8a39a8804e1d0d9d2a6fb74b1071ddc07cb5ec50eb2ebb579a987c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E8 5160 bytes
font_01_sfnt_off00007278.bin
2348ccc71d78e1b7a05ee122de2fb5894c494020becc0a3340d65d145306d134
pdf-font-stream PDF embedded font (sfnt) at offset 0x7278 10772 bytes
font_02_sfnt_off000095aa.bin
b4308b4f36459da157e51d2651eb392495e28425ed726dcf318bcd40832340ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x95AA 18032 bytes