Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46cdd56cdda5947…

MALICIOUS

PDF

35.7 KB Created: 2020-08-04 23:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca726315b539b958118d414024ab591 SHA-1: c6d8de006cc10d6ad709568be01c8c30420a8996 SHA-256: e46cdd56cdda59478dde7f40f7c72840109ea05184b77e49663bb175fe8c39d8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=essential+human+virology+pdf', suggesting a lure to download further content. The presence of numerous external links and the ML classifier's high confidence indicate a malicious intent, likely for phishing or malware delivery.

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=essential+human+virology+pdf
    • http://files.royal-obrienclan-uk.org/uploads/1/3/2/7/132740764/f22acd933200.pdf
    • http://files.stmatthewsdayschool.com/uploads/1/3/1/4/131453870/e88f6936beb.pdf
    • http://files.wrfw887.com/uploads/1/3/1/8/131856984/wawejutudefazi-lufodop-widorida.pdf
    • http://vobamajaw.deanheatingandcooling.com/uploads/1/3/0/9/130969426/lonefexeler.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/84566688165.pdf
    • https://cdn.shopify.com/s/files/1/0440/3625/9990/files/12798776405.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9928/files/biwovuwobojimojamune.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/20156789348.pdf
    • https://cdn.shopify.com/s/files/1/0434/3457/3991/files/39322749883.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/relovimirogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/didonakipakupatiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/modern_calligraphy_practice_sheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/58069166091.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/mafifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/xoberug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/can_t_find_my_way_home_chords.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_off00004db9.bin
dd5e227d173898a1fe08f99427ba0899e4bd4189c05d8e1e4c54d92b08a81077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB9 5576 bytes
font_01_sfnt_off00006096.bin
c68302b3103930a47b8e27ad29c9831e243f77d0bc69ccf00632acc78ded3f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6096 9840 bytes

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