Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d64a244cb13605…

MALICIOUS

PDF

43.5 KB Created: 2020-10-05 23:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e8366e8df9cd0761c442f95a02a40c4 SHA-1: 0aa11f08cc527dd98b6a387f87c58bec9d7e1c54 SHA-256: 79d64a244cb1360597ffe3518abed215adabea1bbca529bf6218d1cf41979a5e
154 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious sites, specifically advertising a "Brawl Stars hack apk sandy". The primary malicious URL identified is https://gettraff.ru/strik?keyword=brawl+stars+hack+apk+sandy. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful content, likely as part of a phishing or scam campaign.

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://gettraff.ru/strik?keyword=brawl+stars+hack+apk+sandy In PDF document text
    • http://files.lilbitsofhome.org/uploads/1/3/0/7/130776852/d4801e5cffd8a.pdfIn PDF document text
    • http://files.bassriver-nj.org/uploads/1/3/1/8/131856311/polul.pdfIn PDF document text
    • http://mumedewa.excellentwoodturning.com/uploads/1/3/1/4/131455543/5713221.pdfIn PDF document text
    • http://files.phoenixhypnobirthing.com/uploads/1/3/1/4/131452958/8c4e388b01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0067/4720/files/32888580604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/willamette_week_voter_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/5769/3091/files/52829011823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9632/9377/files/complex_numbers_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5382/1351/files/77754987042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0206/9667/files/14886940147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/poema_para_enamorar_a_mi_novia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/sowogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c6f8c3-266d-4fa0-ad09-67a1af7e4321/wobotepujida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd86585e-d0de-4cc3-9f36-cf4e836115e4/53529842979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf62e3d1-7c97-4cd4-9578-5360ae82caee/mukusanugixobimakidejomon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb89e2e-f3f2-4967-b4e7-29afbdb29625/24285626636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef60512-82b6-40c1-ab37-b638f027cded/fuxemosaxadapokavemeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A61 2880 bytes
SHA-256: b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167
font_01_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 5468 bytes
SHA-256: 10262d592d3a101d4a9b6f368cb13ac4942b5686501442e155a5b1b27efb1b93
font_02_sfnt_off00007749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 12924 bytes
SHA-256: faed39783cb43f0c4a99ed9cb75409d6f83fd1e7bb3903092a09d089052d78e5

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