Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f31e2b7a2b6e19…

MALICIOUS

PDF

41.3 KB Created: 2020-08-16 10:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72300f365b86dd082aa7b4632a694909 SHA-1: 5f529d46dae0f10c00b31e59d6131adf57300aa1 SHA-256: 33f31e2b7a2b6e19e381b4447942780853fbd071809b0ed07df518e2a8f8345c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body also contains a direct link to this redirector, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=your+lie+in+april+sheet+music+violin
    • http://files.allkidsbouncealot.com/uploads/1/3/0/7/130739037/1963891.pdf
    • http://files.elderandersontimestwo.com/uploads/1/3/1/4/131483361/fabeg-bisatizer.pdf
    • http://sadopejuk.lksportstalk.com/uploads/1/3/1/4/131407406/pekixapunip_fijajolesum.pdf
    • http://degurare.koubasystems.com/uploads/1/3/1/4/131438216/8174872.pdf
    • http://files.americancampexperience.com/uploads/1/3/1/3/131381151/wonokimuga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/meerdere_afbeeldingen_samenvoegen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/sejurejad.pdf
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/delaware_driver_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5472/6310/files/pezezilabanifosijudigefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/23614097124.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/sapod.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/cursive_letters.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/effective_java_github.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/nexekero.pdf
    • https://cdn.shopify.com/s/files/1/0441/1781/9544/files/36208929880.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/sivudixuloxekunumon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/wrightwood_ca_weather.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/le_couture_clock.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/tabeer_ur_roya_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/joxurukevib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006458.bin
36e63e4c0b8604d42f5102111d06a49fd3dd1be5cde35aba720d1b4733111fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 5192 bytes
font_01_sfnt_off000075db.bin
a1989d1e48f66801423a643be08066ec7711e0ce5709e7d43c374f7d516dcc05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DB 10044 bytes

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