Malicious PDF — malware analysis report

Static analysis result for SHA-256 18922ed1017eeb5c…

MALICIOUS

PDF

48.7 KB Created: 2020-08-15 18:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c02290ab857727f0bbdd7351d66ac6f2 SHA-1: b20ed10c57f939f82a9a43765600e845697eca7e SHA-256: 18922ed1017eeb5cfd82b9181368d9e38d0a918d351cb2aafd3c4a6581cd4c0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword suggesting a lure for application downloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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.com/pify?keyword=k-+addons+apk
    • http://gupof.serenityvineyards1977.com/uploads/1/3/1/4/131482995/mivejimamawo-pamuja-sulofukapolu-guvudamaxatipeb.pdf
    • http://www.ismallrt.com/how-to-use-k-addo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0823/7473/files/pathophysiology_of_coronary_heart_disease.pdf
    • https://cdn.shopify.com/s/files/1/0433/4577/2698/files/exercices_corrigs_atomistique.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/lisa_kleypas_hathaway_series_epub.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/fajar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/theory_of_catastrophism.pdf
    • https://cdn.shopify.com/s/files/1/0435/4827/8935/files/arsenic_in_food.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/netcut_pro_apk_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0440/0008/4126/files/corporate_finance_and_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6435/files/83786943754.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/dakatisose.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_off0000824e.bin
774d4c837006567689a14d65de81e4b174d24762eb20a71ee45ca33fc82335c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x824E 4892 bytes
font_01_sfnt_off0000930e.bin
1b5b3baf300143bd7084ce3a47b09de4c322d481750308db2a240cce1369a08e
pdf-font-stream PDF embedded font (sfnt) at offset 0x930E 10412 bytes