Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2123990da2ba57…

MALICIOUS

PDF

44.7 KB Created: 2020-08-24 19:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e74e04181497294d9ca1e49ec6f8a1c3 SHA-1: fbce1cab988fd6c540a4e62bc4a0e1a8478627b9 SHA-256: 1b2123990da2ba5793b98c0705dd0a5945c00687bc433891c80049a88ac33009
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a reconstructed URL pointing to a redirector service. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution chains.

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=meningite+bacteriana+pediatria+pdf
    • http://files.k-p1964.org/uploads/1/3/2/3/132302859/8399380.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/81067480758.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/tikemuja.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/towitulamax.pdf
    • https://cdn.shopify.com/s/files/1/0461/8993/6798/files/altunta_kfte_form_makinas_fiyatlar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/92020264015.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/card_games_for_2_players.pdf
    • https://cdn.shopify.com/s/files/1/0437/1474/0373/files/gazenekev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/best_free_calendar_app_for_android_phone.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007029.bin
43477a64a7cccc6568719ad757ba6c74cc4dab6ade4ca1613badb3e1d8fc7126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7029 5260 bytes
font_01_sfnt_off00008218.bin
a60b5463218e5d9f2fcd8647d8021d9c1d591a78844336db4b714646245c47b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8218 10760 bytes

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