Malicious PDF — malware analysis report

Static analysis result for SHA-256 755fbfe0f8942664…

MALICIOUS

PDF

45.8 KB Created: 2020-08-20 09:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d432fcc63d77910028d5b0894d044290 SHA-1: 4ea7036038e80296713d9c9ef6d737a404965a80 SHA-256: 755fbfe0f8942664e376a6d1d30d1f70b27b10ac0edfc8380adb2c3c65fbc7ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with a heuristic identifying it as a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=wimbledon+bracket+2018+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests an attempt to manipulate search engine results or distribute further 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/pify?keyword=wimbledon+bracket+2018+pdf
    • http://rejonalu.opmetoc.com/uploads/1/3/0/7/130739693/jonofunadakavorigag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/career_surveys_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/luvodegis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/the_ballad_of_reading_gaol_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/tatudoratimoluzusume.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/tetumegetora.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/kabezimufopefinabegada.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/animal_farm_student_journal_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/muvejumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/dotajife.pdf
    • https://cdn.shopify.com/s/files/1/0437/8483/1125/files/44268990104.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/gamojenusuka.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/6802313464.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_off00006674.bin
fe0f4a63001f1cbfb555b8e49cc444d17f97f8f2c959cc35e7f456feba31212e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6674 5860 bytes
font_01_sfnt_off00007a5f.bin
8c46e459853ee47580177f298d7068b91cd08a60db826013f18bc1a50fd4e494
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 15896 bytes