Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef7fc7b1a2ecd25…

MALICIOUS

PDF

36.1 KB Created: 2020-09-02 02:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f1a784ecca99e9d95146ca7209407b SHA-1: c95a54e6c7578da7861fbb670ac5b62040f61ff1 SHA-256: 0ef7fc7b1a2ecd25778a1dd52a5d1268c072b6ce092d3a419009770780da2fef
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'blood pressure monitors manual' and a URL pointing to a redirector. The presence of many external PDF links, some pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=blood+pressure+monitors+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/tuwax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/graphic_design_bangla_tutorial_free_download.pdf
    • https://static.usrfiles.com/ugd/35dc59_119d2cca40814a9880b747fbcd4b2f7c.pdf
    • https://static.usrfiles.com/ugd/805d2a_c91b6857ac384381afadfc4799ef52d2.pdf
    • https://static.usrfiles.com/ugd/e4ee87_375d9b98b1714664b21b70a9aa704bcc.pdf
    • https://static.usrfiles.com/ugd/83f04e_58250e0d1e324735874a91bdee0e03fb.pdf
    • https://static.usrfiles.com/ugd/3aee12_1ab6bc4e0d4c4e74b10e088499fff376.pdf
    • https://static.usrfiles.com/ugd/a48928_7cb4936a0d6f49e3a67d0744ba203c27.pdf
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/venamowiweviwenikabojezi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/cervical_cancer_screening_guidelines_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.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_off0000515a.bin
992400094183317a85ddb79501759c553da7b30cb4d101d3689d7a7f6dc0e771
pdf-font-stream PDF embedded font (sfnt) at offset 0x515A 5152 bytes
font_01_sfnt_off000062c2.bin
e91ad998f3a5a9f8215a4c7ac44e9ca6fc257620ab261e0ba2186d68ad7eaf2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C2 9720 bytes