Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a70ca52fab0e1…

MALICIOUS

PDF

41.1 KB Created: 2020-07-15 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e600f3c8a3d0c31b9bb5e3d1d8ba41 SHA-1: ff6ddec6138b637620ca78213738422be599fb8b SHA-256: 2d7a70ca52fab0e1db50b674411754999b6758e257def9565a5ca1fb53c23e3c
152 Risk Score

Malware Insights

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

The PDF document is disguised as a preschool worksheet to trick users into clicking embedded links. The primary link redirects to a malicious site, and the document contains a large number of other links to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to malicious redirection.

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/wb?keyword=numbers%201-10%20worksheet%20for%20preschool
    • http://files.lodgeyggdrasill.com/uploads/1/3/0/7/130740222/gifufe.pdf
    • http://files.dragvette.com/uploads/1/3/1/3/131381614/tuturagiso.pdf
    • http://files.nikkieartistry.com/uploads/1/3/0/9/130969334/5201055.pdf
    • http://files.littlerocklabradors.ca/uploads/1/3/2/7/132740415/joxota.pdf
    • http://files.juicybeetlegames.com.au/uploads/1/3/0/7/130775375/8d9bd.pdf
    • http://files.msfoegler.com/uploads/1/3/0/7/130739837/gamebifiliduteki.pdf
    • http://files.chardoncommunityactionteam.org/uploads/1/3/1/3/131384018/pugotut-newifuniz.pdf
    • http://files.ericksager.com/uploads/1/3/0/8/130874575/melogelib.pdf
    • http://files.nikkieartistry.com/uploads/1/3/0/9/130
    • https://bafunev.files.wordpress.com/2020/07/vifupo.pdf
    • https://volutabeni.files.wordpress.com/2020/06/zajetodadolarejodurogoso.pdf
    • https://xelalum.files.wordpress.com/2020/07/wimisikuwevagufa.pdf
    • https://lokuwafaj.files.wordpress.com/2020/07/lejusodijosax.pdf
    • https://judazej.files.wordpress.com/2020/07/66506806152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/39954151634.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/mexodudexifib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/tiwefusonibenexesuvaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/47067639773.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/sulisazagixametirena.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/kusibiwomoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.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_off000062eb.bin
a8d1c791b6ec5234cd618a82f62278a87d77765f4053763cd97ffc4d28c2e34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5264 bytes
font_01_sfnt_off00007502.bin
07ac9dba83fac525dce37fb3f8f88f05676f3e8a9e83ad871b62bca537d5665e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 9824 bytes

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