Malicious PDF — malware analysis report

Static analysis result for SHA-256 722cdecd99c71111…

MALICIOUS

PDF

125.4 KB Created: 2020-08-14 01:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ab4bbe686cf1ef572e69bec496c76b0 SHA-1: 071a51b612edaa40980591da43c94fec4123171b SHA-256: 722cdecd99c71111140bca30492e45da384ac46b365d0b64f480f87f2d8cae4c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with keywords related to child labor reform. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to external resources, many of which are PDFs hosted on Shopify. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a malicious site or download further malware.

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.com/pify?keyword=movement+for+child+labor+reform
    • http://files.chrisvanwyhe.me/uploads/1/3/1/8/131856991/3241658.pdf
    • http://files.stjohnsmtpleasantmi.com/uploads/1/3/1/6/131637384/8e3d33001feb2.pdf
    • http://xixesapur.ditchwerks.com/uploads/1/3/2/6/132696414/e6ec4d38b98b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/30502643856.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/viporitokedozifopinuwiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/vamodilaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/48480679410.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7607/files/5th_symphony_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4196/3683/files/vikosoziximuniganav.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/67496345390.pdf
    • https://cdn.shopify.com/s/files/1/0449/8427/1016/files/vewugajamuvusukawalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/dubeluvusupowuki.pdf
    • https://cdn.shopify.com/s/files/1/0448/3910/8770/files/50937779250.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/64747379299.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/nigas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/sifizadawabukikarenur.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a59e.bin
c6513bdaba752c0524d684c538629e0e98087ace9aa143aa84d4701109bead9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A59E 3332 bytes
font_01_sfnt_off0001b19a.bin
1d9f882da88bd6eeaf063f2aeed7bce9fb0834c5048c6bb6dd9e08ae6d8fdc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B19A 5288 bytes
font_02_sfnt_off0001c374.bin
0a8f9c46c5432221bcd18a45e2fa7afcb22b47141a9a938fa6baa8e324ffd97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C374 10800 bytes

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