Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7fcacc59fe70ad…

MALICIOUS

PDF

38.0 KB Created: 2020-07-16 21:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38e8f8184442d4e35a64745906dbb5d2 SHA-1: 548a89547bb771cca45e99f098f962ea44242aa7 SHA-256: df7fcacc59fe70ad2ee2d8b3f08d990a03bf3e4966ae65aaf8a0f42e749c09aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document functions as a link farm, directing users to a multitude of external PDF files hosted on various domains, including a known malicious redirector. The primary lure appears to be "Insinkerator manuals online", suggesting a phishing or scam attempt to drive traffic to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings clearly indicate malicious redirection and link farming behavior.

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/wb?keyword=insinkerator%20manuals%20online
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdf
    • http://files.associazionelaghitaninelmondo.com/uploads/1/3/0/7/130775232/bisimejo.pdf
    • http://files.vafercapital.com/uploads/1/3/0/7/130775867/nivej_gusakigaveg_dijerikikezade.pdf
    • http://files.stagecoachtrailers.com/uploads/1/3/2/6/132682564/rikugorumanowi_muwulovatobur_pibuzozona.pdf
    • http://files.nextprepkids.com/uploads/1/3/1/4/131437930/pupexupakonuwula.pdf
    • https://zonaselid117862540.files.wordpress.com/2020/07/bobiget.pdf
    • https://varoses.files.wordpress.com/2020/07/najoluneluru.pdf
    • https://rokonofivadi.files.wordpress.com/2020/06/satupokedupigati.pdf
    • https://diwunibe.files.wordpress.com/2020/07/tawafatepev.pdf
    • https://migosefej.files.wordpress.com/2020/06/fefawepewod.pdf
    • https://xagiruw.files.wordpress.com/2020/06/sakivufuwoputodulevoza.pdf
    • https://miteduxom.files.wordpress.com/2020/06/24125005748.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/62201833028.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xoperesotojazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/nuvekajotor.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/rikokub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/jubujiwujolimafigakadopow.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/46457747182.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/ruxuvopaxurifiwelepezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/rotupemuxalisefuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/torujanadusubarasojulul.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_off00005984.bin
f34e2a0d8f8647d61f17745179fce9a51b12dec58687144199373d633045468a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5984 4712 bytes
font_01_sfnt_off0000695e.bin
621a58011e8d85e3cfd3845fc74506c8823bd81edd759c66bb507a68ebb3d231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 9720 bytes

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