Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d52c6a7bd761e64…

MALICIOUS

PDF

47.8 KB Created: 2020-08-05 23:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e331ebbaf89777af6eed807acc200c28 SHA-1: 46a9f1821d2ed713d021059a9054c2ae779e09d8 SHA-256: 4d52c6a7bd761e640f1486bd8f1b11b3c4e70de4fb16706a534083d7b669d604
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=story+children+learning+english+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on cdn.shopify.com but lead to potentially malicious content. The ML classifier also 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=story+children+learning+english+pdf
    • http://files.nicolanotes.com/uploads/1/3/0/8/130813643/gogadut-jivowazajadob-dapanof.pdf
    • http://files.annettecargill.com/uploads/1/3/0/7/130775257/9181538.pdf
    • http://files.tri-villagetrails.org/uploads/1/3/0/7/130775897/varonamugagavij.pdf
    • http://files.amykaissar.com/uploads/1/3/0/7/130739099/giwuwokevaju.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/key_curriculum_pres.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6068/files/gepulebofurunuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/www_firstaccesscard_com_payment.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/12624095384.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/56097025474.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/capital_structure_planning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/womonevixaxijebuvi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/essential_idioms_in_english_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/84164732732.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/jegotozumuzerilinul.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/40624197289.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_off00006f8c.bin
f79f4d2fdce80f6b69af6f09a273abeac6e2570edcfb4d2a1c2bee9f1c4fda0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 5408 bytes
font_01_sfnt_off000081e1.bin
d0017bba7aca6655e562d53d89b4e84603e6677306161d623f01d6448171cc59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E1 9896 bytes
font_02_sfnt_off0000a3d7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D7 4324 bytes

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