Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a903a6a3ce0c05…

MALICIOUS

PDF

35.3 KB Created: 2020-09-08 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 319359747b949e87e8822c49d5568217 SHA-1: 2a41e72473ec398798a22b224f64a106f555496f SHA-256: 27a903a6a3ce0c05b2dd75e8a8c7a87f1d188c1928972e9183ff4c0ebb451157
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous links, including those pointing to Shopify, suggests an attempt to create an SEO link farm or to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=broadcaster+studio+pro+free
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/hp_pavilion_27xi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/aksyong_pananaliksik.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/39450021811.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/musitetaxisivokigewutubab.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/26726766128.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/printable_clock_face_with_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/impulse_physics.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/malegeweresevagas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/30825930789.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/tafsir_al_quran_dalam_bahasa_melayu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/lard_knife_party.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/85179139561.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_ca3e1863d357481880264a49bfc8a9dd.pdf
    • https://static.usrfiles.com/ugd/40336e_280717691ceb40b994bac054067fd353.pdf
    • https://static.usrfiles.com/ugd/b77b08_fdfebb63b8ae468ab83388c5f7b56b65.pdf
    • https://static.usrfiles.com/ugd/0bcf16_f71f3f1e25c74f77b0f2a370d59cf9be.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_off00004d82.bin
8744df071f276c007c8877c03186d5d24a7199b7f0f8fff86ec38e11e7f65742
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D82 5164 bytes
font_01_sfnt_off00005f25.bin
f96e35f64134dcc132171700e8707786092577a7183355c85fc319e56e1bd269
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 9720 bytes