Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c18fb4d2e553cfb…

MALICIOUS

PDF

46.3 KB Created: 2020-08-24 10:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e0b67c3ad0c5b2ac85fa4be284efcf SHA-1: ef0e9dfbcabd64a709d60d2ee0aea034e826b3e9 SHA-256: 8c18fb4d2e553cfb5e9cac67db1b5c1e6de7abf4915bdbd99fb414fd77b7120d
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=book+acknowledgement+sample+pdf', suggesting a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the true destination. The ML classifier strongly flagged this PDF as malicious.

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=book+acknowledgement+sample+pdf
    • http://pumim.manolyartdesign.com/uploads/1/3/1/1/131164574/4cdd35.pdf
    • http://kazatijo.restorationalleydiy.com/uploads/1/3/0/7/130738524/3055485929e.pdf
    • http://lezizo.maranathabiblens.com/uploads/1/3/0/7/130776132/4893919.pdf
    • http://files.lyndseygauthier.com/uploads/1/3/1/3/131379324/nikipixuw-xikidusorowe-wamagegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8321/8588/files/user_s_guide_to_capitalism_and_schizophrenia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/59396128774.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/cefr_english_placement_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/best_camera_effects_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/hp_10_bii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/novemenuzipikuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/mowesanepukebudawuniror.pdf
    • https://cdn.shopify.com/s/files/1/0465/0824/5150/files/vce_exam_simulator_2._6._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/24885445627.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006963.bin
5394b1184c05ad4a4d04ad0d84779de4b5bf7e6cafb2911c399be6932c8a967f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 5324 bytes
font_01_sfnt_off00007b8b.bin
2317c0f3f377aa406c4d170099fff6a45874eafa9090a73457fd7569cb479ae8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8B 10192 bytes
font_02_sfnt_off00009e7f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7F 4324 bytes