Malicious PDF — malware analysis report

Static analysis result for SHA-256 a870b3e42ab3affc…

MALICIOUS

PDF

55.2 KB Created: 2020-08-08 08:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71d70a02ae84c3d24c8298b192b9ec8 SHA-1: ad0ecf7c342e061d1661362bac6f45d3e40a2184 SHA-256: a870b3e42ab3affccc2d8b25a98fbf82b058dd618fc948a5add6c5fe6ff55aa9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to ttraff.ru, which is associated with a link farm. The document body, though heavily obfuscated, contains the same URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to a malicious URL disguised as a legitimate document.

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=project+management+scope+of+work+pdf
    • http://files.deafeducationnetwork.com/uploads/1/3/2/7/132740214/safonurete_nufiz_kozebab_jurozazipapi.pdf
    • http://mimimi.thekrcshop.com/uploads/1/3/1/4/131454012/wunimozixu_wolatadi.pdf
    • http://files.guildoften.com/uploads/1/3/1/1/131163712/kewotobiruretu_jukuxifuxip_jivib_tevagirux.pdf
    • http://files.millbridgewi.co.uk/uploads/1/3/1/6/131606502/jugajowiboroxiren.pdf
    • http://sukikazad.powderhornmountain.com/uploads/1/3/1/8/131856772/wuwizolow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/75194651614.pdf
    • https://cdn.shopify.com/s/files/1/0435/0446/8134/files/88819125029.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/73837224845.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/belajar_percakapan_bahasa_arab_sehari_hari.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/72130997316.pdf
    • https://cdn.shopify.com/s/files/1/0434/0835/9589/files/bavativuxoda.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/gradient_border_css.pdf
    • https://cdn.shopify.com/s/files/1/0439/8238/9406/files/90281612476.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/pisasemijuxugatuxadenedew.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/zopabufepilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/27145010473.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/61848548322.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_off000099dc.bin
e1d20f466642b08a07267c7d3bcd33a8099f32c9ae9f80cd2e8560d2b27ddfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DC 5676 bytes
font_01_sfnt_off0000ad2a.bin
66e2aba17f4eb70ba95b561287c68d0d631871f6fd4158c9a2912df1ac2d3709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2A 10100 bytes

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