Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8f9dec0aa8dcad…

MALICIOUS

PDF

39.5 KB Created: 2020-08-27 17:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08371504a34705e8c0d85964a21c1f4f SHA-1: 0fa13ca3704a67e6620056ba268b7504bf7e1a01 SHA-256: 7f8f9dec0aa8dcad2c1aab94a072f36c37281d481d68016cfcb2d9fd78dd4dd4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, many hosted on Shopify, designed to appear as legitimate documents but ultimately redirecting to malicious infrastructure. The primary malicious URL, https://ttraff.ru/pify?keyword=calculator+scientific+apk+pro, is identified as a redirector. This suggests a phishing or scam campaign aiming to trick users into downloading potentially harmful software or visiting compromised sites.

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.ru/pify?keyword=calculator+scientific+apk+pro
    • http://files.ukyorthoresidency.com/uploads/1/3/1/3/131383544/fd3f1ac304.pdf
    • http://files.atasf.com/uploads/1/3/2/8/132816195/563820.pdf
    • http://files.eliezercall.com/uploads/1/3/2/3/132302940/3168259.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/dimetivapidaxikogaxuxet.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/23013324079.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2371/files/report_damaged_card_chase.pdf
    • https://cdn.shopify.com/s/files/1/0450/6848/4758/files/boletin_oficial_del_estado_legislacion_consolidada.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2455/files/bubble_sort_in_c_program.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/atresia_intestinal_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/livopudixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xetop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/dogofowamivodukuxudog.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_off00005d2e.bin
f34120ac73014e5ac72eaf444b8b5bfff0698073da6676bc5c29e5f67bc8e0e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2E 4976 bytes
font_01_sfnt_off00006e2b.bin
d7286960bc1e2f4310c8cc904e434d79085c5b0a3d9f925184e5220109b5dbc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2B 10312 bytes