Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2996373e00a1dc2…

MALICIOUS

PDF

51.6 KB Created: 2020-08-20 03:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3f71a536706f58f7ba53fd48d05edc SHA-1: 26857687523f71541b5a14f637914fda164fcd63 SHA-256: a2996373e00a1dc214789d1f21cc45bf7f6a7d4cf8861656889313e6f1445670
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, disguised as a legitimate document, redirects to a known malicious domain (ttraff.com). The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and a seemingly benign PDF filename, suggesting a lure to trick users into clicking the malicious link.

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=dengue+fever+management+guidelines+2017
    • http://files.chirpytravels.com/uploads/1/3/2/3/132303013/ruwizukubisu_wezakafeki_nenizaxatopin_wumelamixebab.pdf
    • http://fuduv.uamanchester.com/uploads/1/3/1/3/131379591/timuzenelom.pdf
    • http://files.blackrivertraders.com/uploads/1/3/0/8/130814586/dudog_pogapebajod_riruvik.pdf
    • http://files.huskersalute.org/uploads/1/3/1/0/131070072/rajirunezopa_tufijivajef_wugalixinab.pdf
    • http://vobixevi.decgallery.com/uploads/1/3/1/8/131872225/88b5025.pdf
    • http://www.who
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/international_business_level_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/lobovajibam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/github_readme_link.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/nibunog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/82600004677.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/born_to_the_endless_night.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/pojonijogez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/pibabokifikagepikeju.pdf
    • https://cdn.shopify.com/s/files/1/0434/1664/9890/files/cctv_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/5496/2590/files/financial_aid_appeal_letter_template.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_off00008ab5.bin
9a1c968451a2255c50aae81434b0e915e6f568a80798fc377f805795d63ea1e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB5 5692 bytes
font_01_sfnt_off00009e1c.bin
2841b932296e57625c7168ab2634256a6239edd5d020968f5c8987ecaa727d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1C 10288 bytes