Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd04f141c9047bcc…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 16:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137013f9068dbfc257f4df89033e1d8f SHA-1: c0418ac0f09e19fbead83c0d23cc61b2f4a69332 SHA-256: cd04f141c9047bcce54ad6dd5af6a3d8a02848b68fd9e850489f1ba2f2324d7a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a significant number of embedded links, with the primary redirector URL identified as malicious. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and 'PDF_SEO_LINK_FARM' indicates a large number of external links were generated. The ML classifier also strongly flagged this PDF as malicious. The document body itself appears to be obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of malicious intent, likely to lure users to a harmful site.

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=varianza+de+una+variable+aleatoria+e
    • https://cdn.shopify.com/s/files/1/0463/5459/6001/files/aws_certification_developer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/1756/6368/files/22279040110.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/print_blank_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/jufelepedaxuzubanawane.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/bosch_automotive_handbook_29th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_e981f0564dc942ea90d5373a1c1608a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/8127dd_18a30be85cbb4ba78acaff705f9e1195.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c92dc5782b14e0b80868bdc27535de6.pdf
    • https://static.usrfiles.com/ugd/fa6f14_5331c5cd820a4b0d95f7389e738fa770.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/refuzopesebifejuxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/39091440677.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/drug_test_chain_of_custody_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/35515627609.pdf
    • https://cdn.shopify.com/s/files/1/0464/8547/1400/files/best_android_app_for_tv_shows_2019.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/vitedewem.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9927/files/anemia_microcitica_hipocromica_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/pusazusiladabobawip.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_off00006a04.bin
b4762285a959c147db4260548e09d304caa036132a3cc5e878b0be56b5b80403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A04 4856 bytes
font_01_sfnt_off00007a99.bin
18baabe4cab34449210ff61503214938ecfd2f4bbcd2d50e4c820a80d4f02eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A99 12064 bytes

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